he isn't on the can't cut list? even if he wasn't, no way. Lincecum is far too talented to just drop and is an elite pitcher in the game. Sure he is off to a terrible start but he will bounce back and then you'll be sorry. Just be patient, your ERA and WHIP will go up once he bounces back.
I'm currently working out a deal with a manager who has Lincecum but haven't even dared making an offer involving Lincecum because I know the manager will ask for a lot in return.