> You start registering to new services with your new account and gradually migrate old services
Try doing this with with thousands of employees with multiple devices and varying computer skills, at the same time, while keeping a business running. Don't forget to factor in multiple 2FA systems, that you also have more service accounts than you probably think, and that your spam filters will change behaviors (for that added bit of uncertainty).
Congratulations, you've identified a market need. If someone builds a tool to do all this (if the market isn't saturated with them already), companies will pay for it. There's plenty of tools to convert to/from Microsoft Active Directory deployments or varying quality, I don't see why Google should be any different.
If a company married Google or any other similar service provider I expect that the migration in case of divorce is going to be expensive. For a single person not so much.
Try doing this with with thousands of employees with multiple devices and varying computer skills, at the same time, while keeping a business running. Don't forget to factor in multiple 2FA systems, that you also have more service accounts than you probably think, and that your spam filters will change behaviors (for that added bit of uncertainty).
Helpdesk needs valium, badly