Chelsea still needs more improvement to match PSG, the performance during semi final can't give them trophy favorite, after scoring first goal they became relaxed and jokey. Another issue will be from the coach when he fails to start his first team or decides to set players off position. In as much Chelsea don't stand a chance, i expect them to give a brief outstanding performance during the final at least as opportuned to qualify for the final, i don't want a similar result as PSG vs Inter in the Champions League final.
Currently Arsenal has been the only team in England that I can say for sure may give PSG some tough time if they ever get to meet, their only problem will be with their mentality, I do not trust Chelsea to stop PSG from lifting the FIFA Club World Cup this time, except PSG suffers a bad day, Chelsea is not their match currently. I hope Chelsea use this to gain some experience be just incase they get to the finals again some other time but PSG is at their peak so we not expecting any less from them.
Now in other words you think that Liverpool and Manchester City won't give PSG some tough time. The likelihood that you are wrong is very high on this one. Liverpool will again be one of the favorites and Manchester City won't probably be as weak as they have been last season.
A lot of things look easy for PSG at the moment, but the CL final was a blackout moment for Inter Milan. PSG would have won I think if Inter Milan didn't play as bad, but now it looked as if PSG could beat all these teams scoring at least three goals.
In the Club World Cup it was two big mistakes made by Real Madrid that gave PSG instantly that comfortable lead. I would like to know what would have happened if Real Madrid didn't make those mistakes.