The PS2 scene is actually far more active with new developments right now then most past gen consoles.
The xbox scene hasnt seen any real developments in a long time, and pretty much all that can be done with it has been. same with the psp.
The gamecube didnt ever have a big following, and only now is seeing a boom becuase of the wii.
The dreamcast scene has and probably always have loyal and active developments again it has past its peak though.
The PS2's Library not its amount of HB content is what really makes it shine, and being able to play it with out the use of a laser or disc swapping is what draws its scene base in my perspective.
It's a good time to be a part of the PS2 scene.