Unfortunately, the AmigaOne or Pegasos are not positioned well as gaming computers. Not only is the developer support not there, but the entry price is much to high to attract casual gamers. While I don't doubt there will be great games for both systems (hopefully originals). I doubt there will be any "killer app"* that will lure people, and their money, away from PCs and consoles.
* I mean game in this context, not application software but I think the phrase fits.