The PS2 IS backwards compatible.
So we already have a backwards compatible system.
The A1200 was also backwards compatible with an A500.
Or are you talking about a new computer that run's Amiga software out of the box??
Which would be pointless in my view, why pay all that money (Which it would no doubt cost) when (Win)UAE has reached such an advanced level, I imagine that 95 % of all Amiga software ever released for the A500/A600/A1200/CDTV/CD32 works with (Win)UAE now.
IMO it would be a waste of the manufacturers money for very little gain.