Its quite possible Linux wouldn't even exist, had the Amiga survived, and evolved.
Highly unlikely. Linux is too different from AmigaOS. To re-architect AmigaOS to a point where it could supplant Linux would take a massive effort - you'd need to add memory protection, multi-user support, reduce the GUI dependency, and provide a full Unix-compatible API, as all of these are stuff that the vast majority of uses of Linux *depends* heavily on.
Keep in mind that while there are millions of people using Linux on the desktop, that's still a miniscule niche for Linux compared to use on servers and embedded devices where the features that appeal are often extremely different from user-interface heavy devices.
Also, Linux started in '91. By the time of the demise of Commodore, Linux was already starting to get serious traction on the server side but nobody were really targeting Linux at the desktop side at all.
