Yes, consolidation and layoffs. Go see how many KCG guys were kept by Virtu. If anything the industry has gotten smaller. People are just buying up flow now. There are no "big" HFT firms when compared to proper buy side.
> the space is commoditized and controlled by a few firms
Yeah its funny, I still read outrage about those greedy "HFT players", as if HFT was still highly relevant. It was a blip in time of the financial markets when no one had high speed trading but a few. The alpha has been washed away.
> the space is commoditized and controlled by a few firms
Few firms != big firms