I agree with you two that even without an economic crisis, some banks would go bankrupt, and depositors would lose money. But to be fair, it cannot be said people's trust in banks is almost zero, that is not true. That will never happen even if more banks fail, as long as people continue to trust the government, they will still trust the bank.
Banks will not go bankrupt if there are no cases of economic crises, trust and regulations that harm them. Banks only control third-party capital as service providers, so the economic crisis and public trust are very influential. Imagine if everyone withdrew all their money at the bank, then it is certain that the bank will quickly go bankrupt, although cases like this are rare because fiat is still quite needed by the community.
As the adoption of bitcoin expands, it is not impossible that people's trust in banks will decrease, moreover, there are many problems faced by banks today, especially services that have problems almost every week. There will always be pros and cons in any system and even in bitcoin, but it depends on how they are resolved and what advantages are offered to users.
Using bitcoin to evade taxes in your country will not make bitcoin legal, that just makes the government hate bitcoin more. Another thing is don't expect to go against the government, they are still the most powerful people in your country.
Bitcoin is an asset that the government has always been against, because they are worried about bringing down the old system and if people are being honest that's why regulation has always been pushed. However, if you take a closer look, bitcoin does not act as an opponent but a partner for fiat to push each other. Real proof that in my country bitcoin is taxed and we have to convert bitcoin to fiat when transacting.
It is this mindset and concern that is continuously being circulated and actually I don't think that far ahead, because people have their own evaluations of bitcoin and fiat. Honestly or not bitcoin provides a choice for the public and fiat still acts according to its function.
Bitcoin or banking both have pros and cons, no one is perfect, and they have their own use cases. Use both for the right purposes, and we'll be safe.
Truth is not a matter of how they issue something, but when used they provide convenience and its own benefits. That's why bitcoin is getting wider to adoption at this time and of the many advantages it offers.