If that were possible - to be able to have an Ultra function with the best of amp/cab simulation as per G2 at the expense of most of the other processors - I would think that many users would be very happy, but of course they'd need their amp/cabinet of choice to be one of the few "chosen" ones. How do you work around that dilemma? Thinking way outside the box (and probably the realm of possibility) but FAS could offer to SELL "blues" packages, "classic" packages, "Modern Metal" packages, etc. as Firmware upgrades, rather than just giving them away. I think that would make a lot of Ultra owners very happy, and I for one would pay $100 or so for a "package" that really nailed the amp/cab sim aspects for my chosen sound(s).
Again, just thinking out loud here...realistically in my wildest dreams, I doubt this will ever happen b/c I doubt that the Ultra can handle even the most basic G2 amp architecture, and it is probably not financially worth it for FAS to develop and implement this type of firmware strategy. It'd be a very neat option if the did though.
I was just discussing with a guitarist how the Axe-Fx is used, and he figured that most guitarists only use a handful, or maybe oven just one or two specific amp/cabinet combinations for their gig, unless they're doing a GB or cover gig that needs to cover a lot of bases stylistically. I wonder how close to the mark he is with that assumption. (thinking of starting a poll for this...)