in terms of purchase and sales bit coin holder's are safe but the lack of proper monitoring system by implementing different protocols client are demotivated for using this currency on investment projects.Every country's government should established a policy for securing those client who are holder of bitcoin like an cash or deposit account holders and this types of policy help to motivated bitcoin holders for investing different sector for establishing new entrepreneur in order to development of economical condition.
What you have highlight is the ideal thing that should happen for government to protect the citizens investment irrespective of where they choose to keep their money either in fiat by ensuring that there is security of life and property, in the bank by ensuring that banks don't fail and people lose their money and even in digital currency to ensure that the investment is safe.
However, the other two options were made possible because government can regulate the way its being done and even the statistics of how its being printed and distributed. But for the latter, it can only be possible if government can regulate bitcoin and that also comes with its own cost which might be something that does not augur well with major participants or even difficult to do because of the decentralized nature of bitcoin.