bullshit
when we've reached a point where the team can no longer communicate then we are not a team and I signed up to play a fucking team game not to be disrespected or watch others be disrespected to the point we must lower the quality of the game itself to perform.
Not to mention the mute button isn't going to stop anything half the time and sure as hell isn't going to stop them from making attacks on someone's account or attempting to harass them through others or commit slander.
But even then its is likely to affect performance when the players are unhappy.
If you are going to be a dick why should I play videogames with you? I'm an adult. I don't need this victory so badly that I should have to stay and put up with your shit. If you don't want me to surrender than act like it, if you remove the ability to surrender I will simply do what is necessary at my own discretion, I will not even bother warning you in some cases.
TL;DR
The surrender option enforces a necessary idea of courtesy and reinforces an unnoficial state of majority rule. If it is removed do not expect anything good to come of it. if you want less people to surrender then put fucking humanity before your win/loss and maybe you'll see a difference in how people react to such a thing.