Also if you are going through the effort of changing email providers then now would be a good time to look into buying your own domain to use in order to decouple your address from the email provider.
How so you come up with an easy, memorable email for day to day use?
A losing business model considering the growing amount of people who are sick and tired of the aggressive ad placements all YouTube.
Kicking out everyone who doesn't log into a Google account would lead to an immediate loss in viewership throughout the month/year, and that wouldn't do well with investors.