First of all, I assume you are speaking about GPU PhysX effects, as the PhysX SDK physics engine is quite popular on PC and consoles.
As for popularity of the GPU acceleration, it is actually not that obvious as it seems - there is a huge factor coming in, called - Next-Gen consoles.
Currently, GPU physics (PhysX based, or even OpenCL or DXCompute) is basically not interesting for the developers, since current-gen consoles do not support it, and almost all AAA titles are oriented on consoles.
However, the next-gen will have some GPGPU capabilities, but ! - it does not mean that GPU physics on consoles will become popular.
So, speaking globally, GPU PhysX may become:
* More popular, if GPU physics will become a trend and NVIDIA will follow the stream (for example, port the engine to OpenCL if needed)
* About the same if GPU physics won't find it's way into console games.
* Less popular, if GPU physics will become a trend and NVIDIA will go against the stream (for example, won't fully utilize console GPGPU features)
I wouldn't make a prediction right now, we need to wait and see.
But, of course, since we are on PhysXInfo - so I hope all will go well for PhysX
So to me it's worth keeping as a Physx card
Right now, it is worth keeping for sure.
This year, the release dynamics of GPU PhysX games has gone much better
2011 - 2 games
2012 - 1 game
2013 - already 3 released, 2 in development