User ID Implementation
About Google's Policy to implement User-ID, there is this point...
You will give your end users proper notice about the implementations and features of Google Analytics you use (e.g. notice about what data you will collect via Google Analytics, and whether this data can be connected to other data you have about the end user). You will either get consent from your end users, or provide them with the opportunity to opt-out from the implementations and features you use.
With give your end users proper notice and get consent from your end users, are these the cookies announcement you have to put on your Website? Plus, updating the terms and conditions to fit in the User-ID data collecting parameters?