You must be joking? There is a trivial way to hide the traces by using mixers. Why do you think ransomware and black markets today exclusively run crypto not fiat?
The thing is, this is a strange argument, you want a sudden world wide adoption, like, tomorrow every biz owner wakes up and decides to accept bitcoin, so that you can buy your coffee at your local starbucks, have you thought through this? how does the total adoption happen what steps should happen before.
I assume it has to do with using a transparent open ledger...