In my gigging area, (to my knowledge anyway), it's completely class "D" bass heads being used in live bands now.
I knew it was eventually inevitable because of D amps availability.
You still see a SVT head in use, ((on TV)), but I can't remember the last time I saw a non-D head in use locally, especially a all tube amp.
Predominately, it's various manufacturers 800 watt head being used in conjunction with whatever cabinet/cabinets the player was already gigging with.
I'm just curious, has most of the old school amp heads been moved to the rehearsal area or into a amp collection in your area?