Or, to clarify things a bit let us say that Atari doesn't either. Say the Amiga is on a 3rd path, or Apple buys it and integrates parts into the Macintosh or something. But C= doesn't get it and there is no Amiga that we'd immediately recognize.
What does C= do next?
Pursue the C900 and make a go at Data General's (or even Sun or SGI's) marketshare?
Push the C65?
Push the Colt series, die on the vine as a PC-Clone manufacturer (which they essentially did anyway)?
Honestly, I think perhaps the C900 might have been their best bet (again, assuming no Amiga). Presuming that the bad **** that went down due to management looking to raid and dump the company, Coherent, running this windowing system:
http://hack.org/mc/mgr/images/mgrscreen.png...on a workstation as inexpensive as C= could provide them may well have served the company quite well. Coherent/MGR was also targeted at x86 systems so a later transition to that platform would've been fairly easy, and put Commodore in a sort of Compaq or HP situation in the early 90s.