Some problems I'd note for any resurgence of the RTS genre:
* There hasn't been a huge RTS hit in ages, so large studios aren't going to push large chunks of cash into them. It's a self-fulfilling prophecy, and you may disagree with whether large studios should act this way, but that doesn't matter, because the observable fact is they do.
* RTS games are still pretty expensive to make well. There hasn't been a breakout indie RTS, and nobody has established a default cheap art style for these. It's not like platformers where the world has accepted we can get away with pixel art forever.
* Streamers rely on their ability to self-commentate, but nobody can play an RTS while talking.
* Even back in the heyday of RTS, everyone I knew played custom maps rather than the actual RTS. I'm pretty sure that crowd is all in Roblox or modded Minecraft these days.
And some bright spots:
* People /are/ trying to make indie RTS games, more than I've ever seen before.
* Tooth And Tail managed to look great while using pixel art. It's very high-production pixel art, but more importantly it's only one unit facing. Indie RTS costs will go down as people experiment with that.
* The game randomizer community keeps building new community-run tournaments and fan commentated races. This means there's an increasing amount of talent available in the wider gaming community for organizing tournaments and commentating.