I cannot remember one time where one system was dominant, in the early eighties, you had the atari 2600 and about 5 major consoles besides it, then apple2 a and the ataris and commodores,
after that, nes, neo geo, c64 and later st and amiga and then snes, and the sega systems additionally, after that there was the pc, nintendo, sega and later also sony...
I think the current state of affairs is pretty much like it used to be, just the variety of cheap homecomputers was replaced by a dominant all in purpose PC and the number of console makers are now down to three.
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