To be clear, with the exception of a few proposals (for instance the so-called Volcker rule), the new regulatory framework does not directly address the issue of downsizing a too large financial industry.
Rather, its goal is to enhance financial stability, by reducing the riskness of the whole system via macro-prudential supervision, and by curbing the risks undertaken by single financial institutions, via micro-prudential regulation. Nevertheless, it is plausible to believe that the new measures will also have an impact on the size of the financial sector.