Cycles
When I first began drumming, there were a few guys out there with bigger kits (Louis Bellson and Buddy Rich had what we thought were big kits) but most drummers were playing a three or four piece kit with ride and hats and maybe a crash cymbal. That was average. Drummers were kept to the back and all they were expected to do was to keep the beat, nothing more. Drummers like Ringo Starr and Charlie Watts came out of that tradition. Then it all changed with the likes of Ginger Baker, Keith Moon, Carmine Appice, John Bonham, Mitch Mitchell and Ian Paice. Drums started stepping to the front a bit more and the kits were expanding. Lots of us ran a bought more drums and started to practice with more stuff. Kits grew and grew and most drummers were now working with at the least, 6 piece kits with at least 5 or 6 pieces of metal (most had more).
Now it seems that it is getting popular with younger drummers to play with much smaller kits. Lots of us kept a smaller set up at home to use for practice, but I'm seeing drummers in clubs using 3 and 4 piece kits with a small ride/crash and hi-hats and that's about it. You can certainly do the job of keeping time with that, and occasionally play a fill between your snare and a tom, but a drummer with that set up just isn't going to step out as much. You'll be Ringo Starr and that's about it. The public doesn't want to sit and listen to a snare drum solo (mind you, I have seen and loved some wicked snare drum solos, but I'm a drummer so that doesn't count). I am seeing the drummer being relegated to the back more and more ewith the newer groups and the kits are getting smaller and smaller. I guess it's just cycles.