4x had been dead for a decade before their rebirth. RTS is not even dead. Total war warhammer has great real time tactic and several RTS have been out. Aoe4 came this year. I don't understand what people are missing.
The ongoing support for Age of Empires 2 is proof that the RTS will continue to endure, and they got it 90% perfect a couple decades ago. Microsoft was even able to do it without ruining the previous versions of the game... looking at you warcraft.