At this present, Banking deposit is very lowest profitable. Infaltion incrase day by day. World economic fall ! many bank bankrupt held for this ression. Same refection in bitcoin. But, few days look up bitcoin price is increse. Previous 2 or 3 week ago when bitcoin price 17000$. Today bitcoin price 23000$ up. So, bitcoin invest is very profitable.
But I think despite of that fact, there are still people who keep on using banks because they think their money is still safe there than if they hold it on their own. If they want to take investing seriously then I believe they also know how to diversify their funds and allocate it in different things which can bring them some profits like opening a business, investing in stocks, real estate, etc..
When the economy collapse, indeed that not only banks/fiat are affected but BTC can also suffer although all of them has a chance to recover. BTC is volatile and can dump more but that's fine since it can still recover what it lost and earn more than it.