Top bankers have been leaving Goldman Sachs, Morgan Stanley, Citigroup and others in rising numbers to join banks that do not face tighter regulation, including foreign banks, or start-up companies eager to build themselves into tomorrow’s financial powerhouses. Others are leaving because of culture clashes at merging companies, like Bank of America and Merrill Lynch, and still others are simply retiring early.

This is certainly a concern for the banks losing top talent. But other financial experts believe it is the beginning of a broader and necessary reshaping of Wall Street, too long dominated by a handful of major players that helped to fuel the financial crisis. The country may be better off if the banking industry is less concentrated, they say.

“If the risk-taking spreads out to these smaller institutions, it is no longer a systemic threat,” said Matthew Richardson, professor of finance at the Stern School of Business at New York University. “And innovation is spreading out too. This is a good thing.”