"The only fanbase PlayStation 3 will probably lose are RPG gamers, as AAA RPG titles such as Star Ocean 4 and Last Remnant are going to the XBOX 360."
Sorry to say that but in Europe more than 50% of the PS3 fans base are RPG and Action-RPG fans. In Japan the Situation is even more severe over 85% play consoles for RPG and JRPG games.
So to lose too many of them to the Xbox would be a great blow for Sony, at least in Japan and Europe.