I would like to point you to the MiniMig, WinUAE, MorphOS, AROS, AmigaOS4, the slew of products from Individual Computers (although they have had a few bombs), the iMica, etc., etc., etc..
The Amiga landscape was really ugly for a long time, but the last few years have been a consistent stream of exciting new products actually released, and it keeps getting better every day.
The biggest challenge I see for NatAmi at this point is finishing the project, and getting it out there before the MiniMig line surpasses it. With the first generation of the MiniMig platform released, and in wide use, we are now weeks away from having the second generation of MiniMig released in the form of the Replay boards. This will bring the MiniMig up to parity with any hardware that Commodore released.
While NatAmi aims to be better than what Commodore released, they do need to get it finished soon, as we don't know what level the Replay boards will achieve when they hit the wild, and no doubt there will eventually be someone that moves forward with a third generation of MiniMigs that will surpass the NatAmi target.
If you look at the memory thruput of the various boards you'll see that they are all in currently different classes...
- Minimig uses SDRAM, small fpga; performance limited to an '020 with no AGA
- I believe MikeJ's board evolved to DDR1, medium fpga; performance is like an '040 with enough space for AGA and super hi res modes
- NATAMI is DDR2 in burst mode 100% of the time with a larger and faster fpga, 100x blitter speed, 100MHz 060 minimum, room for extra chips/cores to add 3D processing; overall system power between a PS1 and a PS2...itching closer to PS2.
So you'll excuse NATAMI development if it takes marginally longer than the others...
The Minimig does not need to change as it's goal was to be an A500 and it has succeeded in that admirably.
MikeJ's goals have also been met as his board will emulate all classic Arcade cabinets. He really doesn't have much incentive to make it faster other than if he can lower his costs along with it.
Natami is being developed with the future in mind, not a simple emulation of the past.