I liked watching Bob Mansfield's appearances in apple videos because he is more like me (an overweight computer nerd style dude), and less like the other apple leadership (skinny health nuts with california accents or openly weird like Jobs). Not a slam on Jobs, but he would stand out even working at a Taco Bell!!
I thought perhaps he was being edged out too...but he's independently wealthy, and he's young enough to work again in the future. Perhaps start up a new Thermostat company with Jonny Ive, just to stick it to the other thermostat apple guy. The world is his oyster, but I'll miss seeing his appearances.
I don't remember exactly but I recall being surprised by Bob's proximity to Steve's widow at the Apple memorial thing (he was right next to her, either sitting or maybe just milling around). Anyway, he's either completing a last thing (iphone5 launch, rMBP) before retiring or perhaps he's being edged out in a friendly fashion (as friendly as such things can be).
Nothing is forever, and eventually the entire leadership team will leave...either thru retirement, quitting, or dying in the saddle. Given how Woz is managed (seems like he's tolerated with a fake "universal" key but kept isolated), I'm unsure if Apple would tolerate having "emeritus" folks hanging around (even if they were no longer productive enough to sit at the big table).
Nobody spends this much time thinking about senior leadership folks (except CEOs maybe) of other tech companies...for this apple is special I guess. The only other VP level exec I track is the guy who's SOny's "VP of BluRay Superiority". With a stick.