Lol, these people have absolutely no idea how any of this work do they? I mean it is really funny to me that they would be considering to ban bitcoin at a time when many people are avoiding banks and going into bitcoin because they trust bitcoin more than they trust these banks.
If they can not successfully improve their bank system and fix it, they will have to find alternatives to indirectly protect their rotten bank system. They have to build up as many barriers as possible in order to prevent as many people changing from bank system to Bitcoin transactions or cryptocurrency transactions.
I don't think they will succeed completely but some people who naively belief in what they saw, what they heard will be against Bitcoin and cryptocurrencies. Some people in society will co-use bank system, Bitcoin and cryptocurrency because fact is we can not exclude bank transfers in our lives. Many activities and payments must be done by bank system.
I get that they want people to go back to banking, because that way there would be a lot of money in the banks and they wouldn't crash
Bank runs come and go and will return. Each time it will cause bank collapses but it won't change how society need bank and use it. However, I don't think any impact from banning Bitcoin or cryptocurrency to prevent bank collapse. It happened in the past when there was no blockchain, no Bitcoin, no cryptocurrency and banks collapsed by their dead weakness.