If we based all game production decisions on playerbase and sales numbers then literally 99% of the games on steam wouldn't exist. The entire games industry would be chasing Minecraft, GTAV, LoL, and Elder Scrolls and nothing else.
I'm sorry, but if you can't see how people would be disappointed with Valve's first new game in 4 years being another game-as-a-service and an obvious rehash of another super niche in-vogue genre then you're being obtuse. It's really hard to see how this isn't anything but a Hearthstone-chasing cash grab. Who asked for this?