Staffa - 7:23 pm on Oct 3, 2011 (gmt 0)
Future: Google Store => Customer
I'd say, near future.
They are already demanding uniform info from shops who list on G Store (former Base, whatever they call it now) to make it easier for themselves to consolidate all the info provided.
They already have payment facilities
the only link missing yet is a formal Price comparison --> Buy now --> Pay here
.... and leave all the "hassle" like overheads, inventory, shipping, chargeback, etc. to the actual shop owner.