Rotation especially among the European elite is one of the biggest fallacies on this board. The fact is that Barcelona and Inter Milan before them all had a very set lineup. Contesting for Champions League and the Premier League would be quite easy if you could field two separate teams. But there isn't enough training and time to field two completely different teams and even if the team were to cycle forwards chemistry would be lost. There is a reason that most people can guess the front line for Barca on any given day.
For the most part, my fellow blues seem to suggest that Dzeko, Balotelli, Aguero and Tevez are going to share a single forward role or perhaps a two forward front at best. The issue isn't so much that a team can't have 4-5 strikers. The Rags do it, but with relatively lower profile players. The likes of Welbeck, Hernadez and Owen are all at the beginning or end of their careers. The one occasion where a major player has sit for them (Berbatov) he left and his future was placed in doubt for the entire summer.
There's already rumblings out of Chelsea that Anelka does not like sitting on the bench.
Its not completely crazy to suggest that once Nasri signs and the attacking midfield is supplanted with two creative playmakers and two forwards that playing time will become scarce. Carlitos is a headache. But he'll be a bigger headache if he isn't on the pitch, I'm sure you all remember the argument he and Mancini had while he was warming up.
Color me crazy... But one of these men will need to make way for a more veteran player who is comfortable with sitting long spells.