A wide literature (I have in mind for example a very recent piece of empirical research by Langfield and Pagano, 2015), shows that economic growth tends to be lower in economies with a bank-based financial structure, particularly at times of falling asset prices, and systemic risk to be higher. A “bank bias”, as L&P dub it, is bad, in any circumstance.
But even if we believed, just for the sake of the argument, in the optimality of banking dominance in our financial systems, here comes another hard fact: also as a consequence of the new regulatory and supervisory framework, banks are less and less willing to lend money to risky borrowers such as SMEs, because of the heavy burden of non-performing loans which is the legacy of the crisis; because more capital is required against risky assets, and capital is costly.