Umm no. I meant after a multiplayer game, it might go back to a victory screen and a briefing for the next single player campaign mission. I'm not sure what effect tricking the game would have on post game dialogs. (dialogs = windows, etc.)
By that point, the network connection would have been terminated, and there would be nothing linking the players. They'd have to go back to the multiplayer menus to reconnect. Which of course means leaving the single player campaign, which you never started, but somehow ended up at a menu for (possibly). It all depends on how the game goes from one level (in the campaign) to the next. I don't know if it's based on level data, or hardcoded into the campaign menus. If it's based on level data, then tricking the game engine by changing level data (to make it seem like a campaign mission was played, and thus to show the movies) will also change how the game tries to continue on with more levels.