Actually he never said anything about PS1's success at all this quote has been twisted he was asked about the rise of JRPGs and fans of the genre and his response was as follows.
"[People who play RPGs are] depressed gamers who like to sit alone in their dark rooms and play slow games,"
PS1 was never mentioned at all in the quote.
Yep, you're right.
This comment is about RPG's, specifically aimed at square, not the PS1. The old Gamers’ Republic magazine article that's spawned these recent articles is just wrong.
"[People who play RPGs are] depressed gamers who like to sit alone in their dark rooms and play slow games," he noted in a 1999 interview. Yamauchi - who incidentally has prided himself on the fact that he has never played a videogame - went on to call RPGs as a whole both "silly and boring.""
What a guy.