How sweet the late 90s would have been with BeOS on a fast PPC!

If Jobs didn't return to Apple, that's probably what we would have got. Their exit strategy ended up being to get bought by Apple and provide BeOS as the new Mac OS X.

Apple went with Jobs + NeXT instead.

Didn't they sell a dual socket PPC BeBox?

Dual 66MHZ 603 CPUs at first, and later dual 133MHZ 603e CPUs. For the time interesting, but hardly head and shoulders above the 200MHZ Pentium Pros of the same era.