I beg to differ. Classic hardware, well cared-for, easily outlasts all modern equipment but industrial server stuff. And the price of classic hardware is hardly going down any time soon, thanks to eBay scalpers, which is all the more incentive not to sell - if you do want it back, it's going to cost you dearly. (And while I'm not going to dish on PPC hardware in general, I will say that you're not going to come out that far ahead selling a classic machine to buy a Pegasos or Sam system.)
I don't think that was a statement advocating PPC alternatives. Rather, I think he meant boards like the Replay and the Natami amongst others.
These replicate the original Amiga experience (with some enhancements).
NG PPC OS' attempt to build upon the Amiga legacy and go further.
I don't see these two markets as competitors.