So there is no such thing as "banking secret" for Swiss residents. Hence even if Credit Suisse is nationalized, it won't change anything for their customers, except perhaps an increase in trust.
[1]: https://www.fedlex.admin.ch/eli/cc/1999/404/en [2]: https://www.fedlex.admin.ch/eli/cc/51/117_121_129/fr#art_47
Of course, if you’re the government of an African country trying to get to the accounts of some former strongman that used to rule the country I’m pretty sure that the secrecy is still there, but confronted against more persuasive powers (like the US in the recent past, most probably also the EU and the Swiss national government) I don’t think that said secrecy stands any chance.
The good news is folks in government are probably pretty implicated in this, so they will probably try to make sure there is a pretty strong partition.
People would trade many things without being treated like criminals just for doing voluntary exchanges.
States are extremely greedy. I am of the opinion that they should know the less the better abt ur money or whatever.
On top of that look at what the current central banking policies are provoking... come on, it looks designed to empoverish us...