"The days of a trader making a living by generating $50k to $75k of adjusted gross annually are over"
It's not clear what your point is. If you put the Schonfeld quote in context, it's clear that they're simply pruning the smaller players. I'm not that familiar with Schonfeld, but there are obviously many Wall Street firms that are not interested in doing business with "little people". It's been that way for a long time.
Taken out of context, the quote seems to imply that $50-75k is neither a reasonable return, nor one worth pursuing. Someone who says that is entitled to his opinion of course, but I think it's pretty laughable.