Of course, we cannot use just one victory to conclude that Chelsea is the strongest especially, in EPL. EPL clubs is not a different league, because the clubd understand each other game patterns and they're use to playing each other. I don't think that Chelsea can win EPL next season, because we have strong teams that wouldn't allow that to happen. You have to play a lot of matches before you win the trophy.
winning the club world cup does not mean that when the new season comes, that Chelsea will have more dominance even above the likes of Liverpool that are going to play as the defending champions or arsenal that will still come into the tournament with the intention of winning it at lest for the first time or even Manchester that feels that they messed up last season and so should recover back and get a chance to reclaim there lost glory. at least, winning the FIFA club world cup has giving them the mentality that they are worthy of big things but truth is that it will not come too easily. they will have to work and really fight for it and be ready to do it consistently till the end of the season. that is the only guarantee of a better season.
Yeah that's true but it would boost their morale against the next season don't for that they've won a trophy and important one before winning this FIFA club world cup so you should know how motivated those players would be. They might not dominate the league but there would be lots of improvement especially as they've bought new players to add to the squad. Anyways when mentioning teams in the EPL don't include Manchester United cause they're not a serious team.