I would assume the vanguard strike list will keep levelling with the level cap. There will always be a top tier random strike list that will have a chance for the latest gear and whatever the upgrade materials will be for that gear. Ie level 28 strike list with 1st dlc lvl 30 with 2nd dlc etc. Like there is a lvl 26 Tiger one now. So xbox users will suddenly get 2 or 3 extra strikes in the rotation when the deal runs out. Will still be the best way to get materials. Yeah it sucks but it's not totally useless and it will be new content to xbox users.