I wish someone for once would make something they promised, sell at a price the promised, stop moving the goalposts and stop j&rkin off at the expense of the amiga community, just put up or shut up and ship out !! said my piece.
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.