Much is posted here about vacuum innovations both real/hyped [i.e. halo].  This current decade has produced advancements in technology [filtrete paper bags] and innovations in the vacuum industry:  i.e. robotic vacuum sweepers, bagless vacuums, steerable vacuums with ball wheels, and a MIELE upright.   I'm sure there are others worthy of mention too. 
Question:  What is the next most wanted/needed vacuum innovation/feature?  I say it's a cordless vacuum with a decent run time and the cleaning power of a full size.  There are some decent attempts along the way:  Westinghouse, TTI/HOOVER.  What do others think?
Carmine D.