A Byte magazine editorial praised the newly launched PC as being the "Rosetta Stone" of computing for offering such a choice in operating systems. In practice, with PC-DOS being 5 times cheaper than the other two it was a standard from the start.
I mostly used QNX with PCs myself until Linux came along. So though it took a long time, PCs did eventually run nearly all known OSes.
I can’t find sales of CP/M and UCSD-Pascal, but I imagine they aren’t what Microsoft started generating from their OS.