I am not too sure about this. Popularity in gamemodes other than survival, skyblock, and parkour, and maybe-ish creative are weak. Although we cannot say for sure how the creation of this gamemode will be received by the current playerbase and the new playerbase, I think that it will not survive for long. First off, there are many variations on bed wars on multiple different servers. To attract new players, manacube would have to devise a way to create an original and unique twist on bed wars. Second, people have gained rewards and unlockables on other servers. To give those up to completely restart on a new server can be devastating.