You say that, but you don't know for sure. Remember getting rid of Nintendo creates a parallel universe where Nintendo aren't preventing all their 3rd parties from releasing software on other formats. The likes of Castlevania and Metal Gear solid also have origins on non Nintendo platforms. These would no doubt have just found homes on other companies systems.
Also going into the 90s arcade gaming was its own scene. Which was more what European computing drew from. I don't doubt Sega would still have had home consoles, without Nintendo's anti consumer practice's holding their software lineups back no doubt these would have taken the place of Nintendo. Companies like NEC, Panasonic, Phillips, Amstrad etc would still all also have involvement and so it wouldn't be unexpected for Sony to follow into the market as a result of that. Given their kep rivals were making these new fangled gaming systems.
Neo Geo might also have entered with a stripped back less powerful home system were Nintendo's grapple of the market in the late 80s/early 90's not so iron fisted.
RIP Dad 25/11/51 - 13/12/13. You will be missed but never forgotten.
