There's a bit of a "war" going on in DT. JP went from 6 to 7, and now to 8 strings. JM added his bass pedal board. MM scaled up his kit to insane size (in comparison to MP). Backing tracks were added.
I know it's a somewhat lame thing to say, but I wonder what DT would come up with if they had one guitar with a store amp, one simple keyboard, a classic drumkit, and a bass.