The reason why they can't just implement this is probably because they don't have enough resources yet to be able to do this or have the money needed to make it into a real thing and from what I understand, they're going to need some kind of planning for this right because they might skew some of the accounts during the process.
Any one trying to launder money through these casinos should be out of their mind to try it. AML policies are strict here and any caught doing so will get their account locked.
A number of such cases eventually spill over to this forum as fake "scam accusations" too but majority remain silent because of the embarrassment. Getting those accounts migrated would mean more spotlights on their accounts and more chances of getting caught, so I dont think they would want that anyway.
Let primedice be the legend as it was without all these new features.