I wonder why anyone would even think of buying shares with a local bank or saving huge part of their money with them, when they could save for a long-term with Bitcoin and make huge returns later, Bitcoin blockchain makes it very secured and the only ways an investor is at risk is saving their asset with a wallet that could easily be penetrated by hackers or fail to safeguard their private keys.
They have probably not yet discovered Cryptocurrency or compared the profitability of both assets, and there are countries like ours that protect or insure deposits of a certain amount.
The banking industry will not or cannot die. There are sectors of industry where banking's presence is important to push their operations; banks and cryptocurrency can co-exist, and they don't have to shut one another.
Investors can diversify their portfolios; I don't see banking as a dying industry. The government can help sustain their existence. In fact, some banks are government-run and funded.