They'll edge off any rivals in their way, and in this case, Bitcoin is going to be a rival so they're going to make sure to regulate it into oblivion to make sure it doesn't stand a chance at all.
The banking system will just be paying off the politicians in order to make this happen. Going to agree with you on the regulation though.
No it won't happen that politicians will take over on charges of any possible bribes just to make this implemented. People would be the reason why it shoukd be on the country's banking system on digital currency adaptation specially with bitcoin transactions. If politicians will be making this difficult, well its a different story for that and it will deal to silent corruption.