It seems that since the grunge era began in the early 90's, the tendency towards bigger drum kits with lots of(or any) mounted toms came to an abrupt end! Suddenly everyone plays simpler kits with maybe 1 mounted tom and 2 or more floor toms. Roto-toms are out, lots of cymbals were out, double bass drums were pretty much out, etc. But you still had the heavy metal and hard rock drummers who kept the large kits with 10+ cymbals, 5+ mounted toms, 2-3 floor toms, double bass, etc. To each his/her own, but I still love to watch guys like Mike Portnoy play a HUGE drumset, and regularly hit each and every piece though!
I think with a lot of today's musicians, unfortunately its more a product of not being all that talented, so therefore not needing many drums or cymbals! Not to knock guys from the 80's and before who used basic kits but were extremely talented(including jazz drummers), but I think much of todays "musicians" probably use pre-programmed digital drum machines to lay down the percussion tracks in the studio anyway!
I was watching a video on youtube recently where a person posted a video of ex-Nirvana drummer Dave Grohl, and posted that Grohl is the best drummer ever. I kinda got in an argument about that one!