There is a real possibility that United could be fully gone, they could finish the group fourth place as well. They are going to play against Galatasaray, who they lost to before at their home game, so it wouldn't be the most shocking thing in the world to lose to them at away game too, and they are going to play Bayern as well, which they could definitely lose too.
That is a possibility and could happen, Galatasaray will play both, and if they win United and tie Copenhagen, and Copenhagen loses to Bayern and ties Galatasaray, that means United will be fourth and gone. I am not saying this will happen, there is of course still a chance that they could go up, but that doesn't mean that they may not as well, there is a very real possibility that they could be fourth and gone, and that's not good for them at all.
United's Champions League display has made them prone to disqualification, they've not been able to meet their contest objectives and they've been lacking points too, their next game against Galatasaray looks threatening because at the moment, they're a less better team than Galatasaray and after which, they'd play Bayern Munich which is certainly going to be another loss for them.
It's so sad because now they won't even get the chance to switch to the Europa League and they'll be left to battle our their domestic league game, only if Manchester United as a team would work on themselves, and make efforts to righting the errors that they're faced with, only then will they stand a chance of even coming up a bit but its likely too late for them as it concerns their UCL contest, their corrections and work should be put in place ahead of their league game.