So yeah, not sure if anyone would want to do this, (it wouldn't be too much work I guess). But with the new released Climbing pic axe. So like, cap the server at 10-15 players. But it would have lots and lots and lots of challenges using basically common sense and some team work. There would be like Climbing, using fire and stuff to burn weight off of elevator type thingamajigs. Hunting (for survival), so yeah. Watch some Tomb Raider 2013 videos and you'll see, that this would be kinda cool in Blockland.
Again, it wouldn't be a server that could be 100000 players. It would have to be limited. Maybe host 2 or 3 of them depending on how popular the first one is.