there is already a compensating effect in the current onslaught games where the node's life is equal to the number of enemy nodes linked to it, or something... like they also build faster , and the enemy nodes linked to it would also be weaker... but when the rest of your team is busy trying to kill people attacking the powercore, leaving you to actually do something at the last node, the compensation wont have much effect...
what really hurts is when you get spawncamped by a tank in torlan, and i just wish that servers would take torlan off their rotation because the gameplay really feels beta-quality in that map....
alternatively, they would have a different type of spawn protection compared to deathmatch games, as in it would be several times longer, and doesnt switch off when you fire a weapon(because the powercore is supplying so much high-tech energy to your team in your base, etc)... that would be a better way i think...