Chelsea have every chance!
With players such as Essien, David Luiz, Romeu, Sturridge to name a few I am sure Chelsea will have as good a chance of winning it as Bayern, in spite of there home advantage.
With their dertermination, and Luck i have to say aagainst Barcelona at the Nou Camp, will Bayern playing at their home ground be as difficult, who know only time will tell.
It is simply time for some of the fringe/younger players to step up to the mark.
Momentum is key, and with the players banned for the champions league being able to play in the remaining league games and the FA Cup Final, Chelsea should be in a position to field a relatively fresh sqaud for the Champions League Final.
But hey I am biased!