Azeroth is a Titan.
At this point in time, it seems to be the only being capable of battling Sargeras and the Burning Legion and winning, that we know of.
To do so, it has to be born and:
a) change shape, thus redoing the appearance of the whole of the world of Azeroth forever.
or
b) imbue us with its Titan powers, turning the players into Titanforged beings.
Currently, we are the strongest members of each our orders. We are their leaders. Paladins, Warlocks, Rogues etc. There is nowhere to go from here but up. It makes no sense from this point to keep getting Bear's Bracers of Might +10 when we're facing the most powerful beings in the universe. The next leap in power has to be exponential.
There's also option c) , I guess, where Azeroth wanders around in the form of an actual planet and fights the Burning Legion, which would be really, really fucking weird. But then again, we have pandas, so all bets are off.