I'd think Excel-based games would be more common. It's dataflow programming after all, which is the only form of massively parallel programming that ever caught on in a big way.
I really liked Glitch. The aesthetic was really cool and it always felt cozy. Was sad to see it go, but I can kind of understand it since I don't know they ever had a real business model to it.
Not really; MMO is just a massively multiplayer online game, it doesn't have to be an RPG. It could just as well be an FPS, RTS or any other genre...
</nitpicking>
Making an MMO is an incredibly hard but rewarding endeavor. There are so many subsystems that you can design and program that you will never end the game; but you will end much wiser.
Then they tried making another MMO, but ended up making Slack instead.
I really hope they get cracking on another MMO soon.