Possession/in traffic receivers are all insurance for when Brees arm goes to crap. It will probably lengthen his staying power. He's good now but we all have to be mindful that it will probably drop off a cliff inevitably.
Not necessarily. He doesn't have a bionic neck like Manning and Brady doesn't seem to have fallen off any cliffs lately.
All these rules protecting quarterbacks seem to really be making it so they can play longer, with Brady/Brees being the first generation of QB's to benefit from it.