I recently read the final book in Brian Bagnall's trilogy on Commodore's rise and fall. It was good to get closure on the Amiga days, as well as some more insight into the unreleased C65.
If Commodore had wanted to seriously compete in the 8-bit space, and had shipped a version of the C65 before 1990, that would've been very interesting. They could've kept game publishers interested and competed with Nintendo and Sega for game consoles. They could've even had a game console version of the C65.