Hey man, the majority of real war is just waiting, for armor to infantry.

Except maybe planes.

I prefer Respawn in this game. It makes for faster paced multiplayer for those who just want to get their fix of Mechwarrior for the day without playing for a minute and then waiting five minutes. For those who prefer the No Respawn idea, you can always do it yourselves, much like Day of Defeat. In Day of Defeat, many people play in their "realism clans", when players fight against each other and will not go back to the battle when they die, they just go to spectator.
For the people who really like that "realism" stuff, those are the kinds of people who will be optimal for organizing a realism clan out of. I'd probably like to play that too, more tactics involved, but I have to admit that it's not for everyone and can cut a big chunk of your players out of multiplayer.