Banks do have a lot to lose if a significant percentage of their business shifts over to cryptocurrency. So it is in their interest to have something to complain about regarding cryptocurrency. Regulation would take some of that away from them, and I believe that ultimately they won't want it.
Governments have a lot more to lose. Politics and popularity are directly linked to economic performance. National economics is controlled by a variety of levers including interest rates, currency creation, and fractional reserve lending. Of these, both currency creation and fractional reserve lending are not available in cryptocurrency. Which is one of the reasons the public like it so much.
But we really don't need either. The business that the cryptocurrency world should be courting is the organisation SWIFT. We need them to integrate into the banking system. They need to upgrade their messaging system to be based on the blockchain and to interface with other blockchains. The easiest way to achieve that is to make it profitable for them. Do the hard work for them, and hand them a solution that they can charge the banks for, and cryptocurrency will be integrated into the banking system.
Don't waste time with politics or making great arguments. Write bullet-proof code and let money drive the outcome you're after.