With all the talk of core vs. essentials, it sounds like Wizards is kicking themselves in the shin again! Where do they get their marketing research from? Oh yeah, Hasbro, who seems to have no clue about the FRPG niche market!
I'm not anti-Essentials... I'm just anti-people-who-are-overly-dismissive-of-anti-Essentials-people's-concerns, if that makes any sense.
But... that's me. That's my bag o' issues. Others might love the simplicity, and they should go ahead and play them. Essentials characters work fine alongside 'old-style' 4e characters. But still, I feel like it's a little disingenious to say "If you don't like Essentials options, then don't use 'em. No problem!" There is a problem when the Essentials options are straight up better than the 'old-style' options. Those of us that prefer the old style will be left in the dust as Essentials options bloat up.
It's pretty clear now that we're not going to see a 'fix' for a Warlock. The poor PHB1 Star Pact Warlock is a mess. Do you split Cha/Con so you can use all your powers? Well, be prepared to have absolutely horrid AC for your entire adventuring career. Do you sacrifice Con to go Cha? Sure, if you don't mind one of your two at-wills being completely and utterly useless to you. Go straight Con? Eh... better read a few levels ahead to make sure you have good, flavorful Con-based options open to you at every level. This is in addition to the usual warlock problems of doing sub-Striker damage, supposedly compensated by being a good "single-target Controller" (the benefits of a good "single-target Controller" kind of fall apart when you can stun in a blast 3 as an Invoker at level 1... but I digress).
I've heard the Hexblade is pretty bad, but I somehow doubt that it's worse off than the Star Pact Warlock. And now in Heroes of Shadow they'll be getting a Gloom Pact*. Who knows, maybe it'll fully eclipse the "old-style" Warlock.
Of course, this is a slippery slope argument, with all the flaws inherent in it. I'm just saying that the constant refrain of "If you don't like Essentials, don't use it!" is irritating, because it's implying that if we don't prefer Essentials, we can happily ignore it and everything will be the same. Until... you run a game with a Hexblade and a poor, poor 12 AC Star Pact Warlock in the same party. It's hard to ignore it when it's right in your face, outshining in you in every category and receiving a steady drip of support even though your chosen iteration of the Warlock has been sitting in the back of the class, waiting patiently for its teeth to come in, since pretty much Day 1.
I'm not anti-Essentials... I'm just anti-people-who-are-overly-dismissive-of-anti-Essentials-people's-concerns, if that makes any sense. I think it's fair to say that, yes, Essentials is receiving more attention than "old style" stuff. Asking "When are we going to see more support for the old-school stuff?" is a legitimate question to ask. Unfortunately, my guess is probably never. Right now, Essentials is new, and they'll likely want to develop it to the point where it has at least half as many options as "vanilla" 4e. Since it took us years to get to this level of content for "vanilla" 4e, I imagine it'll take a while before Essentials is essentially filled in enough to begin focusing on old school 4e once again. And, frankly, by that time, WotC might seriously be considering a 5e.
What I'd -really- like to see is some sort of errata that basically eliminates all the obsolete "trap" choices. Powers, generally speaking, are fun and numerous without getting unreasonable, but we have ridiculous feat bloat. Some, like Human Perseverance, are just plain outlcassed now, making them utterly useless. I'd like to see the "utterly useless" feats basically errated out of the game. I think you could seriously cut down on like 100 feats this way.
Anyway, that was a long, rambling mini-rant. To answer the OP's original question, though, I'd say: "I hear you, but don't hold your breath. Remember the Star Pact Warlock." Besides, we have enough options for vanilla 4e as it is (with the possible exception of a few classes, like the Seeker and Runepriest, and with the horribly-implemented magic item rarity). The only old-school support we frankly need (as opposed to just wanting real bad) is the cutting away of redundancies, like the feat issue I mentioned above. Or maybe a little warning label for the Star Pact Warlock.
Their DDI stuff really burnt me out on their company and to be honest even though I really like Essentials the abrupt break in their release schedule has kind of broken my habit of buying their stuff.
For me it's more the lack of any good content that I might use coming out over the last few months. Then again, I've picked up the Plane Below and Psionic Power, so maybe it's good- they are giving me a chance to catch up on some items I've wanted to buy but have always had something more interesting first.
We really won't know the true direction of 4E for awhile... all the books coming out anytime soon were before any real customer response to Essentials could come about. Additionally, they very recently changed the heck out of the way they're dealing with DDI and the magazines, and pulling multiple books from the future catalog. Considering the backlash, there's a real chance that they'll try to change things to a more medium point, but it's going to take a long time for that to show due to the length of development cycles.
My advice is to enjoy what you have, because pre-Essentials 4E was fantastic, take that which you enjoy from Essentials (there's no reason to be close-minded about them even if you don't care for the trend), and don't build your hopes up too high for future content - you don't NEED it to continue having amazing games, after all. If the books that come out after now don't have what you want, learn to embrace homebrew and 3rd party support.
Whatever you do, don't let this introduce bitterness and spite into your heart as some do. There's no malice at play, simply an unfortunate difference of opinions between fans, and the ever-looming realities of business.

(Dungeons & Dragons)
Rulebook featuring "high magic" options, including a host of new spells.