Many people see laws against victmimless activities to be a direct curtailment of basic human rights. Even in our own lifetime we've seen completely arbitrary changes to which substances and banned or not banned, so we should be extremely wary of future, similarly arbitrary changes (that we can easily get around using cash).
The problem is that the government often creates crimes that citizens don't agree with. Or the majority uses the law to try to force their preferences on the minority.
It doesn't "end" whatsoever. Your notion of it ending means total governmental control or total anarchy. Life is in the middle of the two, the resting point is a continuous balance of two extremes. It's not simple to disregard laws, it's risky and makes you vulnerable.
I think the depends entirely on if the "crime" has a victim or otherwise causes severe problems to society. Though those problems should probably be more severe than then the problems caused by trying and failing to ban a victimless crime, which always creates a black market (and associated violence, which does have victims).
At least in America, there's not a lot of alternatives. The system is setup in a way that favors minoritarian rule (particularly, but not exclusively by the rural) and lobbyists. Unfortunately, that means that diregarding laws that they disagree with is often the only way to represent the will of the people.
Unfortunately it seems that digitalisation often removes a former middle ground and forces a choice between two extremes – like in this case either total privacy, or total surveillance, and there's no choice in-between.
I like cash because I like my privacy but cash making it easier to do crime is an unfortunate side effect, not an end in itself.