Han and obito are not the "end all, be all" of ninjas, they do not nerf anything. Anyone can still play blitz teams and they will do the same thing they always did, but when you do play those types of teams you will risk running into teams with Han or Obito. Chances are you will lose, its not an auto loss, but you lower your chances of winning. What will happen is that more people will switch to teams that focus on debuffs instead of buffs, because it will give them higher chances of winning. The point is, as a player you have to look at the teams you are facing, on your server, in your sageworld bracket, and around your rank in space-time. You need to evaluate what is your "meta" and build your teams accordingly.