It's not a "problem with bitcoin" per se, it just means that bitcoin will have to be supported by banks in the same way that cash is - your assets are kept in a

It's not a "problem with bitcoin" per se, it just means that bitcoin will have to be supported by banks in the same way that cash is - your assets are kept in an account that the bank is responsible for and you only hold a small amount of cash at a time - for it to be useful to people.