I disagree: video games do not have to converge on a single genre. Sometimes I feel energetic and ready for a brain challenge and I fire up Factorio, sometimes I want to play super-chess and I launch a Gary Grigsby game; sometimes I want to just immerse myself in another world and/or culture and I play Blackbook/Witcher/ACS, sometimes I'm ready for some fun with friends and it's CS:GO or R6, or Il-2 when I want the flying version of it; finally, when I want to just enjoy a good story, then it's time for Witcher or Metro.
From Everquest to PUBG which are the two only adult evolvers.
You can tell by looking at what they changed by how copied they became.
And Minecraft and Roblox which are the young evolvers.
Nobody has managed to copy Minecraft and Roblox successfully yet and the AAA studios are stuck in a grind making meaningless sequels.
But then if you look at the technology, you see that theres an obvious combination that is missing: Everquest - RPG + physical action gameplay like mario/zelda + modability of Roblox/Minecraft.
I don't see why this diversity should disappear.