I'd rather it if someone brought out an Amiga-style keyboard wedge case that fits a Mini-ITX motherboard and stick in a Sam440 to run OS4, or an iMica to run Aros.
Since Aros is making its way to 68k Amigas we're going to have a major OS update soon, meaning there's even less reason to upgrade to PPC just to use a newer OS on our classics.
Even if we got a new PPC accelerator, the Sam still has USB, RTG and 16bit audio, fast ethernet and a whole bunch of other features that would be slower on a PPC-powered classic Amiga.