i rather doubt the future of amiga is fpga. fpga is too slow (not even as fast as 040 on affordable chips), too hard to program (none of the few 68k softcores is even fully 020 compliant, not to speak of fpu and mmu) and to expensive overall.
if there is any future its with amithlon like systems imho. either x86 based optional with some fpga expansion for backwards compatibility or genuine amiga based with x86 accelerator running 68k emu. thats the only options i see, otherwise we need to stick to what we already have.
not telling fpga projects should be given up, but i wouldnt expect too much.