To me, honestly, I don't think it makes much sense for them to do so, anyway. They deliver a single GPU that is enough for 99.9% of the users out there, for nearly every title.
Of course, you'd have to expect those users to never change any sort of in-game rendering options...
If you're part of that 0.1%, and you run Eyefinity, then you probably have two seperate cards anyway, simply because you're smart enough to know that cooling is much easier that way, and thereby noise, and end experience as well.
Personally, I think two chips on a stick is the stupidest thing ever. Seriously. Of all the things they could do...two GPUs? 3Dfx's failure wasn't enough?
Multi-GPU in itself is stupid, and barely works. I've been running it since day one, and really, nothing has changed, and it's been many years.
If i want to play a racing game, I plug in three monitors, hook up the steering wheel and crap, and I enjoy Eyefinity. When I'm done, I hook back up the 30-inch, and any other game I play on that. Yes, it's that bad. And yes, I don't expect it to change. And I'm fine with that. these new Dell U2412M monitors I got only weigh like 5 lbs.
I'd personally rather see AMD invest their time and money on bringing us a singluar better product, then many bad ones. Dealing with multiple chips on seperate silicon, while at the same time working on seperate chips in the same silicon, is just simply carrying around that old holey sweater simply because you're fond of it.
AMD has already let go...
Anyway, it seems two GPUs isn't quite enough for Eyefinity across the board anyway.