It was never a relic I feel like. It was always there, this idea of "what if we had an RPG that was an MMO," Blizz just decided there was more money to chase emulating MOBAs and Looter Shooters. Heck Western RPGs are increasingly reliant on talent freaking trees to design your player character.
Just now suddenly the winds are blowing at the MMO's back rather than its front and Blizz is like "hey maybe these 'build your own hero' games aren't so bad."
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And yet I look at the Jailer rankings and see two classes so blatantly out-performing everyone and like 1/4 of them that are blatantly under-performing.