First, they need to start making two maps, one to show to the players, and one for the DM. Honestly, the work they do on maps now? Totally wasted 9 times out of 10. Who gets to enjoy it? Not the players, they get to see a three year old's crayon drawing replication of the actual map. The DM can't even show the players his map, because half the time it has secret information on it. Two maps would fix this problem, and wouldn't involve tons of extra work, since the biggest difference would be the omission of the monster's starting locations and the omission of bullet points noting items with secret details. That probably means that the artist's original version would be sufficient in most cases.
OK, first, I will give my boy, Cadfan, here some XP for this one. Sometimes I disagree with you on a few things, but as a 4e fan, we've got that in common. And it seems we have a DDI subscription in common too. I have worked with Photoshop as a professional for a few years now, and I know it's very possible to do this. Disable some DM layers and resave. Easy-peasy, for someone who is a professional cartographer in this industry. I am not a pro, but even my personal, DM version, amateur stuff is simple to do this.
EDIT: Dammit! I already gave him XP recently, and it says I must "spread it around" before I give him some more.

Sorry Russ, it's cool.
Second, when they use dungeon tiles for delve type adventures, they could include printable detail pieces to place onto the tiles.
This too. Can I print a 3x3 overlay for tile to make the terrain? Sure! Provide me the tile, and I will print!
It's difficult enough creating an array of interesting and original encounters to make up an adventure, without the author's creativity being constrained by being forced to pick from preexisting map pieces. I can assure that none of the most interesting encounters in my own Dungeon adventures--and that's based not just on my own opinion, but all the feedback I've gotten--would have been even remotely possible under those circumstances.
I don't mind a semi-regular delve feature that uses them, but forcing other adventures to use them? Best way to ensure that I would neither use nor write any further Dungeon adventures.
OK, so.... as a subscriber to DDI. I would NOT like to see Ari's name disappear from Dungeon adventures or Dragon articles any time too soon.
I think I'm starting to not like Dungeon tiles that much. I've used them, but I keep finding myself not using them more and more.
I very much like using some of them to dress up what I have on the battle matt, and I'm absolutely going to take a look at that battle box. But for actual maps of the rooms and such... My matt is winning.
Interestingly, I have put the 4e battlebox and 4e Heroic in my shopping cart and have been contemplating this purchase for a few days now. I also like the work that Klaus does. I have almost every counter collection he has produced, either as a PDF or print, or in most cases, both.
Yet, for some reason, I have been holding back on these. my players are liking the mini's instead. One of my players has a bunch of DND minis and I have a few (hundred) myself.
I am using Ed's
Skeleton Key tiles a LOT, though. I had converted the entire mid section of my
Age of Worms campaign to work with his tiles. I have that
RPG Object's Tile manager product. It has helped me make a lot of my maps with all the Skeleton Key tiles I own (and that's more than I like to admit.

good work Ed.).
I don't want or need dungeon tiles from WOTC. Let the other guys do that stuff. They are better at it, and they also have a community that has huge support. The Cartographer's Guild, Dundjinni forums, FourUglyMonsters.com, there's a lot of them with fan support using Campaign Cartographer and Dundjinni to make maps that kick some serious butt. You can't believe how many awesome maps and objects and map stuff you can find online by amazing artists. The CSUAC is just a dream come true for a mapper. I'm serious, a few good URLs and you can be in third-party mapping nirvana.
EDIT:
WRAL Newsreporter: "So, Mr. Catsclaw227, what are these mystic URLs you say I need to find nirvana?
Catsclaw227: "Fnord."