after it there won t be selfish players

[West]

Forau that will not help - that's not a good solution. People still will don't care about reviving too much + they'll gain extra UP.

But non-reviving players are not the only problem.

Also I see more basic problems about reviving. First is just easy dying and getting mad for no been revived (especially on hard waves). People should use their heads and think about situation. For example, if we have a Toxic Wave noone will jump into zombies and run for a revive - it's a suicide. Same thing with Helga. Noone will go revive players with Helga and Hitlers on his back. More examples, I was multiple times writing on chat to separate Hitlers from Helga - maybe one person tried to do that. Same thing - more people is trying to kill Hitlers first, while Helga is killing other teammates. Those are basic problems on this Wave.
Second problem is that most of waves (and also many maps) don't allows to move around on the map. So it's not that easy to run from a save spot to help someone who was cornered or died somewhere. In most situations it is just a suicide, especially on waves like toxic or mixed.
Third problem is a bad timing of players, mainly to go from shop to a save spot. Even myself sometimes I have a problem to do that.

It's very easy to die on RotU. Ability of Zombies multiple times are way too OP. Most of time we have to kill them blinded and stunned (which is most annoying thing on RotU in my opinion).

If you want a solution for reviving players here's my choice:
Self Reviving - what I'm talking about? Each downed player will can stand up itself, but after (for ex.) 3 minutes. Still it will be possible to pick up downed players, but if team doesn't do that they'll take a penality (for ex. -3000UP each one). Self Revived player will get a bonus of +3000UP.