Of course it's the game makers responsibility to make their own game a success. Which is why you have game makers not making games for platforms that would not make that game a success. Hence less third party games for Nintendo platforms that are not themselves succeeding.
Who is responsible for making a console makers platform a success? Of course it is the console maker. Third party game producers are not going to participate in the catch-22 of a platform needing games to succeed nor should they.