For certain large types of crime such as fraud of stolen creditcard data and others, the only bottleneck is the ability to launder the stolen money - with the current limitations, it generally requires recruiting (scamming) 'mules' to do your laundering for you in limited volumes.
That means, if tomorrow suddenly it'd be possible to launder x% more funds with the same effort, then immediately that fraud will grow by that same x%.
Also, for certain types of crime 'following the money' is pretty much the only way how they get solved. Anti money laundering laws have valid uses - of course, they definitely don't need to prescribe seizing legally obtained cash.
And yet it seems that the headlines are dominated by "The Terrorists" and "The Evil Drugs Lords", not "Surprisingly Annoying Credit Card Fraudsters".
Indeed, the very fact that credit card fraud is effective is more proof that the existing credit system needs upgrading and that cash-only is not an unreasonable way of handling these transactions.
That means, if tomorrow suddenly it'd be possible to launder x% more funds with the same effort, then immediately that fraud will grow by that same x%.
Also, for certain types of crime 'following the money' is pretty much the only way how they get solved. Anti money laundering laws have valid uses - of course, they definitely don't need to prescribe seizing legally obtained cash.