It would be nice but I don't see it happening. Let me just say I'm not a D-Link fan boy and I'm just as pissed as everybody else. The thing is, a mod has already posted that a new firmware is in development, but won't say when it might be done.
If you believe what they are saying it's easier to move forward than it is to try and go back. I can see it taking a while because if they release another buggy firmware they will really be in the deep stuff. I don't care one way or the other as long as they FIX the problems.
Except that unless you make it PERFECT (and let's be honest, mistakes and bugs happen) then the lack of a downgrade option is just UTTERLY STUPID.
IF the new firmware allows one to downgrade, then I'm all happy and waiting for the next big thing. But if it doesn't, then it might just end up being us waiting for something that won't work... again... and this whole mess wouldn't have changed one bit. A stable working router is worth much more than an unstable one with more features.
So yea, I too would like a downgrade option. It doesn't even have to be automatic using the interface (I'm fine with using multiple stages and a TFTP app); just give us that option!