I'd like to suggest to the devs a way to please those people who say the game is too easy.
Add a few servers that are say two or three orders of magnitude harder than the normal servers. ie..keep the regular servers, but add in servers where the mobs have double or triple the HP, in addition to the bosses.
Just have them clearly marked as Ultra Hardcore so regular gamers can avoid them
It should be fairly easy to implement and wouldn't cost a whole lot as nothing else would have to change.