I'm fairly opposed to having to protect a spawn point, have yet to see a game where that doesn't just turn into spawn camping. I mean, just look how the one team spawns before the other worked out on strat. If team A gets steamrolled and then starts spawning as a bunch of peasants, well it's no fun getting slaughtered multiple times in 4+ vs 1 fights.
The idea could be a lot of fun, but having to protect a spawn never works well.