There is absolutely no doubt in my mind that this game will fail, but the spirit will be remade by someone eventually and it will be huge.
Id wager, server managament is going to be a big part of the next generation of online games.
I mean imagine playing a game like
No Mans Sky but every planet is a player crated/managed server, you land there and the laws of physics that that manager made is the laws that you have to get used to on that planet.
Im sure in minecaft you could build some pretty sweet D&D campaigns, I dont know because I don't play it
And yes Neverwinter I think was ahead of its time on one hand, but still too complex on the other hand.
Gamers just dont want to learn the tools it takes to basically be a senior game designer at a tripple A studio, so game-a-fying the development process is a big part of the concept being successful, but is also a hurdle that kills most of these types of games.
Mario Maker is a great example of a user friendly level creator, but its also luckily limited by its simplistic side scrolling gameplay.. but smart devs can run with the stuff it proves and adapt it to open world fantasy rpgs pretty easily.