How long will Cassel last (years vs miles) and will McCluster hinder our passing game

[Wyndex]

Cassel is in the 2nd of a 6 year contract. He is 28 meaning he will be 32-33 when his contract is up. He is in his 6th NFL season but only 2 and a half years of real quality playing time under his belt...will he be able to play past his current contract more effectively than other players? I was wondering because if he continues to progress and continues to develop into a Field General I'm all for keeping him around awhile.

Also our passing game was god awful...then McCluster got hurt and suddenly we quit throwing to McCluster on those rinky dinky designed routes...we started going down field and damnit Cassel has done well...the team has done well. Will McCluster coming back into the lineup be a step back with the rinky dinky bullstuff or will we utilize him as one of many offensive weapons? I sure hope it's the latter.