dont rly see him getting dmg boosted blade removed honestly. with current genji, should be fine with 29dmg shurikens and see where he lands from here.
But if for some miraculous reason he gets dmg boosted blade removed, hes gonna need major buffs in his vanilla base AND ult kit considering how his base ult kit is already bad. however, a good alternative (which i dont see blizzard doing at all -.-) is nerfing all the powercreep in this game. Current genji will be fine with either routes.