Utterly Mad

Plus I'm thinking there will be an inevitable point where the player has, through careful tactics or sheer blind luck, become well-armed enough to make stealth pointless. So I could easily blend both ideas by making an infiltration mission transition into an overt warzone.

And exactly. You could mitigate it by sleeping in a bed though, but still. It makes you commit to taking a break from singleplayer, when in most games not HAVING to do that is one of several reasons why I don't do multiplayer anything that often.