at a minimum, it will force regulations to make people produce their identity in order for them to change bitcoins into dollars etc.
It's already happening, but first of all you can always exchange for cash, like people are doing on localbitcoins, or you can not exchange at all. At least that's what we are hoping for. That the economy will allow us to use coins directly, just like we can do in some online stores right now, but this time it won't be online. You will be able to anonymously walk into a store and pay with your phone or hardware wallet. I wonder how they're going to trace that.