The first question how long does crypto last? The answer is, no one will know how long crypto will survive. All of that depends on the human resources themselves who still trust crypto in investing.
Secondly, can crypto die? Yes crypto can die if there is no one who trusts crypto in investing and the FUD news that respects the confidence of the big cryptocurrency miners.
The third, can the government get bitcoin? Can. But we must be smarter in that. And make sure that crypto is not something bad to develop.