Sure, no need qualifying for round of 16 when they can't even make any difference so the best is just give it up and go to the Europa league and try if there can be any improvement.
I think Manchester united isn't in their best form currently, but however the most important thing in football is to keep pushing irrespective of the loses being recorded as some things qualifying for the next round can also boost the players morale and confidence so Manchester united should just give their best if it works out for them fine if it doesn't work out too the move on.
Exactly. If clubs give up in football, then I think Chelsea would have given up since last season, but since there is always hope in everything we do, there is no need for Manchester United to slack. They should try; they may score another match that will luckily bring back their performances as they were before; if not, they are not currently in good form. And I like how Manchester United are still managing their performance to see them play well in some matches even though they won’t score, but there are some matches where they dominate their efforts, but since they're in better form, it doesn’t go as wanted.
However, do you think going to the European League will make them improve? I don’t think so because if they are able to improve, why can’t they do that in another league? I think they should just continue going like this; they will surely get their performance back to where it was before by putting in more effort to their matches, if not because the club is currently experiencing a hard time.