No offense meant but in classic amiga-land what does USB2 get you?
Most amiga apps clock in at a few megs, at most. Moving those off of or to a memory stick at USB1.1 speeds (even through the clock port) isn't a big deal. A stock Amiga really can't do H.264 video, or MP4, or AVI, so you're not moving multi-hundred megabyte or gigabyte files around. CD burning or burning DVD images needs to be done at lower speed on m68k Amigas anyway, so you don't need it for external optical drives. You certainly can't
type or move the mouse fast enough to oversaturate the 1.1 USB bus!

I don't
think classic Amiga systems can boot off of USB; even if they can there's no swapfile or any such thing being used so it's not like the transfer speed of 1.1 will affect you there.
Would it "be nice"? Of course it would! About the only real "need" would be if you wanted to do USB ethernet.
Now, on that x1000 thing, assuming it ever comes out? For it to even be considered a starter USB2 has to be standard. With an eye to USB3.