I really don't see this being a problem with the proposed rule change. If you prepare properly you have a decent setup that can be tweaked using the settings you can change in the F11/F12 menus. If you don't wreck/don't put yourself in a position to be wrecked, you have a full hour to complete a decent lap (x2, given the Friday session). And it doesn't require much admin work at all. You look for "Xxxxx pitted" and if Xxxxx rejoins the track, you spectate them. Easy peasy.
Disconnects would be allowed to rejoin, IMO. A repeated pattern of disconnects, or suspicious disconnects following a wreck would of course be dealt with. As for driving into the garage and doing a shift-p... nah. Run what ya brung!