I don't know if Sanchez gets benched on MNF or thereafter, but if he does, it's 100% his fault and he only has himself to blame. Look at his putrid numbers, nearly last in comp. percentage, QB rating, and yards per attempt. Those are on him.
You can't blame crappy receivers on a 49% compl. percentage when he leads the NFL in off-target incompletions at 35, those are passes that have no chance of being completed even with good receivers.
You simply can't blame the receivers for Sanchez playing like the worst QB in the NFL.
If Sanchez doesn't want to get benched then he better play better and the easiest way to do that is make better throws.