I feel bad saying this but if you follow the lore strictly through in-game you can't really properly discuss lore at all. I know that you SHOULD be able to but the fact is a lot of lore is in the novels. If you assume we beat the Scourge because a guild of 40 people ran through Icecrown clearing them I don't really know if you can be reasoned with @_@
Bolvar could awaken at any time, I would appreciate him waking before WoW comes to a close but we don't know. Blizzard essentially ended that chapter with the possibly to make a sequel should they decide to. Lets be completely honest, Bolvar can be a major asset to the Alliance and Horde, or just the Alliance or he can be a major enemy to us or just a completely neutral army when the Legion one day comes.