There is 4 raids. Yet premade group only does 1. Am I the only one that sees the problem?

I’ve been playing since BC, and it’s mostly us, not Blizzard. The majority of the playerbase gravitates only to the shiniest, newest thing and leaves old content in the dust. Even in BC, there were a few people out there playing older tiers, but most of the playerbase was like “lolwut” and “l2p” when you were woefully ungeared for the latest raid.