I honestly don't understand why so many people think that third-parties will miraculously start supporting PS3 and abandon all else. Third party sales have not been blockbuster yet due to the smaller userbase and games that were heavily hyped just aren't selling the way they could on the 360. By the beginning of next year, 360 will most likely have an even larger gap between the PS3 and it will still seem like a more viable source for 3rd party games.
Furthermore, graphics have shown not to have this glorious hold over consumers that analysts seem to have a delusion about. Some keep expecting Sony to go gangbusters, but the truth is, a console does not go crazy until something new, big, and revolutionary comes along. While PS3 does have many AAA titles coming next year, who knows how far they will have fallen behind these holidays.