I literally just got on to propose almost this exact idea. Only mine involved choosing each faction one at a time, completing each of their quests, and unlocking a strike once all is complete. The crucible "new faction war" should drop up to 335ll faction based gear, but you don't have access to it until you complete the strike. So it would add a new strike, compete with the new light level, add a few pieces of armor and weapons per faction, a new crucible mode, 3 new exotics, and even more lore. " guardians, we must prepare for the old factions uprising. They've banded together to take us out. You must train, fight for you're chosen faction, show the enemy how far you're willing to go to protect the city, and most importantly, show no mercy" - Lord Shax. Remove the mercy rule. give people a faction level advantage, no much, but enough that a level 10 have a very low chance at beating a level 20. So the tower actually ends up fighting some past faction, allowing us to get to see all the tower guardians in action in some cinematic clips. How bad ass would that be?