Thanks for the well put reply!
Yes - diversification is definitely the key! I am not sure about pure PoS systens, as they tend to be very aristocratic and may scare off more real mass market users than attract any old-schoolers...
DPoS like the Graphene chains or Lisk seem better fitted, but also they lack in transparency of ownership.
And why should the masses switch from central banks to unknown private owners of their money? ;-)

My bet is the solution will come, 17 or 2018 ;-)