I think reliable pay-outs and internal tax accounting are the main issues for us.
Would you waive claim of non-receipt of funds in cases of "Bitcoin Exchange" fraud? Banks are regulated, Bitcoin is quasi regulated.
Payment is not complete until you can prove payment. Bitcoin is designed for a more obfuscated anonymous payment. Our accounting staff has experience tracing payments we make when there is a dispute. So, now they would have to learn and experience Bitcoin blockchain tracing of transactions -- at what price?
That having been said, the ECB and the USFED need to consolidate SEPA and ACH to move into the 21st century and facilitate global commerce. There are a lot of reasons they will not do this.
When there is a future in a well regulated cryptocurrency these issues will have been addressed;
Tax evasion and money laundering are the real concerns that world governments have with cryptocurrency.
Solve those issues and it will happen