The Fluxus dead or alive argument is simpler than many people on both sides make it out to be.
Fluxus was a group of artists in the 60s and 70s. The group largely disbanded after Maciunas died. Ergo Fluxus is dead.
BUT... That group of artists set an idea in motion. That idea (or attitude) is Fluxus. The Fluxus idea, attitude and way of being and artmaking is as relevant today as it was then. Ergo Fluxus lives.
I can see the attraction of the first statement for those whose primary objective is to profit from Fluxus, but ss a living, breathing, Fluxus practioner, it seems pretty obvious to me thatthe second statement is more accurate.