I listened live in New York when the Chairman and CEO of Fidelity Investments made this statement at the Consensus conference earlier this year. You can watch the recording here.
Good to their word Fidelity announced today that their customers could now access (view only) any cryptocurrency assets they are holding on their Coinbase account. This is significant as it is the first movement by one of the worlds largest institutional investors to begin the process of introducing crypto-currencies to their clients. To be clear, at this stage Fidelity's client cannot trade crypto through their accounts, but that is the obvious next step.
While on institutions, note that Goldman Sachs is now advising clients on crypto-currency risks and opportunities. See here.