I don't think that is the case, I would jump at new hardware. I especially like the idea of putting a motherboard in a retail box and sell through some local stores.
Yes,
you would, but many don't. I wouldn't, because NG doesn't provide me with what I want.
Many people in the Amiga community are only interested in Classic and new hardware for Classic. Underestimating this when creating new non-classic hardware can bite you in the butt.
For many it's nostalgia, and NG doesn't deliver this. For many others it's the original Amiga games, and NG doesn't offer any advantages for that. In both cases the original hardware and Uae give you the best experience. Then there are people like me who like the original hardware as a cool retro platform. NG doesn't do that either, which is fine, because it's not what it's for anyway.
When you want to produce new hardware that's not related to the original hardware at all, you really have to keep this is mind.