Never had a Manchester United fan ever supported Chelsea to winning any team they are playing against in any competition even if that team is one of the worst team from Bengali. So it's not surprising to see a lot of Manchester United fans not having hope in Chelsea having any chance against PSG in the CWC finals. What I just wait forward for is 13th July, when the ball bounces we can all seat with a bottle of beer in hand and watch from our respective locations. 
Are you being serious right now. There are many Manchester United fans out there that will support Chelsea to win. Haven't you head of someone having a soft spot for another club? That's by the way though, the truth is Chelsea cannot win PSG in any way. They have improved a little but not to the extent of winning PSG in a final. PSG is cooked for this, they are the best team in the world right now. They dont use luck to qualify in stages of any competition, luck was what brought Chelsea to this final.