If they release PSP2 during Autumn 2011, they could keep PSP alive for another two years pricing it as entry-level and and helping its sales publishing enough budget editions of its best games for new users. As a cheap, entry-level system, it would cater for a different market from its current one and also from the future 3DS and PSP2 ones, nobody sane would ever think that people willing to spend more for 3DS and PSP2 latest tech and new games would be the target market for PSP in its late years. So it would be a 9 years life cycle, that could be stretched to 10 years with the latest, almost totally not exclusive, obviously, releases for the existing user base before starting to drop support completely.
We can only wait and see, this is another issue that can't have a definitive answer right now.
