I gotta agree with some of the other posts here that the "obsession" (well, really the number of threads popularizing the P Bass) has increased over the last few years. I've been a member since 2008, and there was nowhere near the amount of discussions about P basses a decade ago that I can remember. That doesn't mean people weren't playing and loving them...but trends come and go in the bass world, like everywhere else, and right now there's a cyclical trend back to the P Bass (at least among actively posting members here on TB).
I think of the P Bass like a pickup truck. It'll get the job done in most situations and can be customizable for some different situations. Some people love their old pickup just the way they bought it and it's the only thing they'll ever drive, regardless of what other type of vehicle is available. Some people will put a more powerful drivetrain in their pickup, drop the tires, upgrade the suspension, paint it flashier colors, drop in headers, and make it into a hot rod, instead of buying a different type of vehicle. Other people prefer a sedan, a 2 door coupe, a production sports car like a Mustang or Corvette, an old beat up van, a restored Model T, etc.... and some people choose to drop the money on a handbuilt Ferrari. The bass world has versions of all of that, and just like those cars, the popularity and demand for each type changes over time.