How can you guarantee that?
Nobody can, but I think it's far too early at this stage anyway to be saying anything regarding Rodgers retiring anyway. There's a big difference in football years between being 32 and being 38 (as a QB). Rodgers is not in any such place yet so I'm against any such notion to be saying it's time to be looking into a future QB already.
I do hope he will be more decisive about his throws next year and hopefully not get too hung up on the hard count thing. And hopefully the O-line will be improved enough to give him a little extra time when he needs it to find his man. But I hardly see 1 statistically down year as a reason to even suggest moving on from him.