Thats a fair assessment and I pretty much agree. Sanchez will have a bad game of course, but I don't think he'll get replaced unless Sanchez strings together a streak of bad games coupled with losses. I don't think you'll see Sanchez playing such games. Even last year, Sanchez had just two games with multiple ints in the first 13 games. Last 3 games were pretty bad for him but I expect him to be more reliable this year with some speed Jets picked up in WRs. That alone forces some pressure back to the safeties, which should open up some running game and short passing game.
It will be interesting to see how it plays out. The season can't start soon enough.