This is one of the hundreds of jokes we see online. Manchester United and Manchester City are brothers and yet they are rivals so such an idea is merely a joke. Even if Manchester United performance this season is very bad that the fans can no longer stay and see it happen, Manchester United fans will rather support other clubs that are not very close to them as Manchester City.
But then after the yesterday Carabao cup Manchester United played against Crystal palace that they won convincingly, it shows that Manchester United might be back in track.
Last season, when there were still many great players at Manchester United, they were unbeatable, but now many great players have left Manchester United, and now Manchester City has many great players who have succeeded in giving their best contribution and bringing them to the top of the standings, a very big task. The challenge is to keep the players playing well and remaining at Manchester City so that they remain at their best every season.