People here think that Nintendo would have been the dominant market leader in that era simply because of a format change. Not entirely true. The truth is, Sony as a big influential company had many companies flocking to their side from Sega and Nintendo, simply for the fact that they were A: new and had a fresh and amazing marketed console B: Incredibly trusted brand C: Tokyo based, instead of Kyoto based. Sony did their utmost to lovebomb the hell out of these studios. Things would probably still go the way it did. As Japanese devs switched, so did western devs. The format is just another reason beneath this big shift of Sony entering the market, but not the main reason for them become dominant.
Liberate Hong Kong, the revolution of our times!