Mearls has said repeatedly the "D&D Next" is just a placeholder name, and ideally he'd like to just call it "Dungeons & Dragons" when it's released.
The thing that I think gets missed in these discussions is that for every group, be that TSR-era, 3.x, or 4e, there are a lot of people who play those editions not because they are ideal and perfect for them, but because they are the best version of the ones available. A lot of 3e folks went to 4e not because they absolutely agreed with everything in 4e's design, but because 4e offered them something they weren't getting from 3e. A certain degree of inter-class balance, or ease of DMing, for example. And if Next can offer that, they can do without Healing Surges, or keywords, or powers. Likewise, there are folks who didn't move on to 4e because, while 3e wasn't ideal for them, they found it gave them the kind of play they wanted more than 4e. Or perhaps they prefer the universal d20 system to the varied systems of TSR-era.
Even for TSR-era and OSR folks, there are some who play because they feel those rules get out of the way better than either WotC edition, but if 5e can provide that kind of play they'd be amenable to it. I certainly fall into this group. I'll play any edition, but B/X is the only one I want to run right now. I know it, I like the kind of play those rules encourage. But that doesn't mean that 5e can't offer me anything. If 5e can offer the same kind of play, then the only thing B/X really has going for it for me is nostalgia. And that's cool, too, in its way. But if I'm trying to get a group together and the other folks I can get together don't share that nostalgia, then 5e offers me something. Particularly if 5e can offer those varied players something that my preferred edition doesn't offer.
4e does this to an extent with Essentials. The players in one 4e group I play with love making characters, trying out different options, optimizing to a certain extent. I'm not interested in that, so for me an Essentials Knight or Slayer works fine. But I'm not particularly interested in running 4e; I like running B/X. So if 5e can offer me the same kind of experience as running B/X, but provide players with more options, without requiring me to come up with a bunch of houserules, then awesome. I'm down with 5e.