Not to step on anybody, but I think that would be a good idea for vets and serious players. To make the gaming experience more challenging, cooperative and enjoyable. It also adds another progression goal, besides the existing levels on weapons, classes and overall.
My idea is; to gain access to play on such servers, the player needs to reach maximum level (50 right now), played a certain amount of time and so on. Something like that. Or even based on certain skills, and combinations thereof.
The ability to "bookmark" such servers, for later return, should also be there. So players can meet again more often.
Any thoughts on this?