The local news radio station here in Orlando mentioned that the Obama/Biden lunch is a regularly-secheduled, weekly meeting.
I think this whole "dump Biden" thing is just Republican operators "sticking it" to team Obama. It's not meant to be taken seriously, it's just to annoy them and perhaps cause them to do something stupid (like respond to it).
Valerie Jarrett, the REAL president, is power hungry and has eliminated anyone who steps on her turf, would never agree to having Hillary! as VP.
Great article here.
Obama’s Strange Dependence on Valerie Jarrett
http://www.americanthinker.com/articles/../2012/08/obamas_strange_dependence_on_valerie_jarrett.html