[pjmlp]

Assuming Apple would managed not to close doors and achieve a similar success with BeOS, the FOSS UNIX guys would have had to contend with GNU/Linux and *BSD as desktop alternatives to BeOS and Windows.

NeXTStep would have probably closed doors as they were already trying to survive by ditching hardware and selling OpenSTEP instead.

Which Sun played for a while, but decided to not adopt it in the end.

[beojan]

I don't see Apple becoming as successful as it did if it hadn't had Jobs at the helm, so we would in all likelihood just have Windows now.

[pjmlp]

I kind of agree, it would be a big "What if".