Do you believe the 3DS rumours?

[superchunk]

Yes.

1) Adding a thumbstick will not affect games already being developed or released.
2) It will allow direct porting from/to PSV far simpler and Nintendo doesn't want a repeat of Wii's decline where it has no 3rd party games. So it will still have its exclusive feature, 3D, as well as all the common general games.
3) Due to game porting possibility, this will likely hurt PSV more as it will get less, if any, 3rd party exclusives and those will probably be based off of the lower spec'd 3DS... similar to PS2 era.
4) Only negative is the millions who have already bought. However... most games I've played (non-FPS) don't even use both sticks or the 2nd stick function could easily be part of the touch screen or button layout. So, most games won't be affected and those that will... well, they will have to upgrade. Something portable users have already demonstrated over and over again an strong willingness to do.

Especially if this new layout is accompanied by a new lower price as well. (in a year when this takes affect with a young PSV... its certainly possible to see a $20 price drop or special game bundles)