Normal IRs are 2K. FullRes IRs are 32 times larger so an entire bank would provide 32 FullRes slots.
I know I'm in the minority, at least among the posters here, but I'd like this to controllable. I have a Bunch of user IRs loaded, not full to capacity, but lots, and I like that I can do that. I frequently end up using factory cabs anyway, but I like being able to check out the variety of cab offerings out there.
Maybe IR size doesn't even need to be configurable, it just works. Load either kind in, the Axe knows what what it is and can use it. Obviously it shouldn't let you load something where it doesn't fit.
After I hear and play through more if these, and more UltraRes packs are available, I might feel differently. But for now, I'm not unhappy with the ambience in the factory and commercial and free packs I have, in combination with the available reverbs and delays.
I'd hate to think that suddenly all existing IR packs are obsolete or inferior, to the point of being unusable. To put it differently, they clearly ARE useable, valuable even.
Also, as others have said, this is a prime illustration of why the ability to reorganize/reorder user IRs without breaking your presets would be so valuable. It's been talked about before, but I'm unaware of any progress in that direction.