I believe it is already been done not a single time and not only with the help of Bitcoin but also other main cryptos as well. And actually transactions are not really anonymous - if you have a private keys and a bit knowledge it can be traceable.
The people who did launder money with bitcoin can be traced in the future as it is a public ledger that has every transaction being recorded and no one can delete those and even with those kind of transparency if fools did launder money, then they will understand the situation they are in when authorities knocks their doors, i am not talking about privacy coins as they are meant to hide every transactions but with bitcoin it is an impossible task.