Earlier quoted context omitted.
Without it, we would have all the big UNIXes still around, adopting BSD code as they already were doing.
Maybe they would still be around in some form, yes, although the mass market advantages of x86 would still have killed of the traditional RISC Unix workstation market etc. OTOH maybe eventually most people would have switched to FreeBSD (or whatever free *BSD would have been the "mainstream" choice), just like they switched to Linux in our universe, since they thought that whatever value add provided by some propriet…
This should be "quantity and quality"