Perhaps the perception of "so few players" might be partially rectified right here on this forum. I wish more people could post their sounds, and especially their composed songs. Pro 2 and OB 6 seem even less represented in that regard. I know there a lot of Pro 2's out there, but not a heck of a lot of music posted unfortunately.
As Chaparral eluded to, there may just be less people posting full songs who use hardware instruments, especially those whom use a high grade instrument like the P12. It is perhaps the most capable synth instrument for any genera IMO, not too hard to use either, so I don't think its a factor of the instrument itself.
General rambling on here....but I'm getting tired of seeing the surge of cut and paste laptop stuff in so much electronic music. Sure the technology of the software is great, but I wish more of it could be recorded as actually played reintroducing the musicianship aspect. I mean I myself multi-track a lot, but I at least play the tracks over each other. There is something valuable in that regard to the listener- just like a true sunset photo versus a photoshopped one might be considered more "honest" for lack of a better word. Anyway...this trend of more folks using a table/PC as a more affordable or preferred method to make music nowadays might ironically only serve to only strengthen our niche as hardware users some day.
Oh, and speaking of classic....age is only one variable for being a classic. (There's is a whole thread on this on this forum about what makes a classic). I went to a car show a few weeks ago and saw on display an in my opinion "ugly" early 80's K car. It didn't quite fit next to the 70's Roadrunner of the same make
P12 will certainly be a classic someday, and perhaps even sooner than age would normally dictate.