It's good Piketty is out there fighting for this stuff. As he mentions in his book none of the problems are particularly new. If you don't do much taxing or regulating, wealth will tend to get concentrated in the hands of a minority of investors with everyone else working for modest pay. If you bring in policies to counter that such as high inheritance taxes and subsided education then things get more equal. The UK went through some of that at the start of the century where the country used to be owned by lord whatever in his stately home and then 80-90% taxes caused then to lose that and the places are now mostly owned by the National Trust and open to the public as historical exhibits. I'm not sure how it's going to play out this time. The world economy is growing quite well. The political will to even things up only seems to get strong enough to make a big upheaval with things like World War 1 in the above case so I imagine not much will change in the short term.