[edit] I often wonder if there had been a in the same price range, better 16-bit or 32-bit successor to the 6502 would things have turned out differently?
Apple also introduced the first LAN (Apple Talk in 1985) you could set up pretty much by just connecting your Macs with a cable. I recall working at places where the only way you could transfer data between the PCs was by floppy, but people who had managed to convince management they needed a Mac were all wired together. Microsoft didn't introduce Windows for Workgroups for another seven years.
If Apple had tried to evolve the II series they probably wouldn't have survived.
The Apple II could not evolve. It was locked down by the expectation that new systems would run old software, and the old software made all kinds of nonstandard system calls, e.g., jumping into the middle of system routines to save one or two cycles. In other words, Apple didn't know their own software interface. Even upgrading to the IIe was a heroic undertaking. This experience is why, I believe, the Mac was always a closed system.
Who would be crazy enough to network 50 endpoints over slow serial daisy chain? Arcnet was another story, but not significantly cheaper.