If you log into a Google account in Chrome, you log into Chrome itself with that Google account. Then Google tools can use your account as an identity signal. This is already available as a feature in Google Ads and Google Analytics. The name of the feature is "Google Signals" - they've posted documentation on how it works and what it does.
This identity signal works cross-domain and cross-device. Google is working to kill off other identity signals with those capabilities that would be available to competitors, such as third-party cookies. (This is also why I believe them when they say they're actively working against browser fingerprinting.)
Basically, the only tracking solution that becomes viable is their own.
Is not hard to imagine that they are getting rid of Cookies because they now have other ways of getting the data, and getting rid of Cookies would make things harder for competitors that don't own the full pipeline.
Even with that, I'm sure that the engineers working on Chromium/Google Chrome are being told that they are removing Cookies for the greater good and don't have insights into the longer pipeline that we're now seeing the middle off.
Most of that can be leveraged by google to replace cookies.
1. https://eur-lex.europa.eu/legal-content/EN/TXT/PDF/?uri=CELE...
Most importantly, the ePD applies to cookies even when they are not personal data. Your post made it sound like the only concern is identifying users via cookies. That is not the case. Non-identifying cookies would not incur obligations under GDPR, but they do incur obligations under the ePD.
Even if you replace cookies with something else (localstorage or whatever), you're still on the hook for all the rules both here and in the GDPR with regards to personal information and informed consent.
Remember that the 'cookie law' says
> Exceptions to the obligationto provide information and offer the right to refuse should be limited to those situations where the technical storage or access is strictly necessary for the legitimate purpose of enabling the use of a specific service explicitly requested by the subscriber or user.
So you don't need a cookie banner for a login session cookie, or a cookie that stores preferences the user actively selected. But you _do_ need a cookie banner, and a way to opt out, for all kinds of user tracking, both first- and third-party.
Of course, IANAL. Just angry at advertisers for muddying up this issue.
You might think otherwise, but for these cases I think there should be opt-in mechanisms instead of the assumption what people want. If they are that off with their ads...
They prob want to replace cookies with something that gives them the same functionality but not have to deal with cookie policies in the EU.