When development on Nspire turns popular, the z80 and 68k will turn less interesting and popular as time moves... In my school Nspire's calcs are getting more users since this year... Nspire cost a bit more than TI-84+SE and its features like larger memory, speed and better graphics makes it very appealing.
z80 development decline is going to happen. It will just occur soon or later, though.
So an excellent emulator of z80 calculators on the Nspire (especially for the TI-84+SE complete hardware support as possible) would be a very nice addition to keep in mind. Even for CAS keyboard... 
There's really no way to tell at the moment. Likely Z80 ASM is simpler than ARM ASM, so many may stick with Z80 because it's eaiser, and they're already familar with it. Just look at when the 68k calcs came out and developed over the years. Not everyone jumped ship to the 68k series. Of course the Z80 series was more widespread in schools and "qwerty" calculators weren't allowed on standardized tests. That's another factor, it also depends on if schools systems embrace the Nspire more in the coming years. If not, Z80 will still be the most popular simply because of the number of people using them.
I'm not sure of the technical limitations of the nspire, but would a GBA emulator be possible?
As far a size, GBA games are anywhere from 8MB to 32MB from what I've seen. As far as preformance... it seems doubtful to me. NES emulation would be much more feasible, hell maybe even Genesis.
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You probably just mis-typed something somewhere. =) Debugging can really be a pain in the arse sometimes though!