Earlier quoted context omitted.
There are plenty email providers out there. Free and paid. It should not be a problem for anyone to switch. Moving off of Gmail doesn't mean to self host. It is a bit of work to tell anyone about your new address, but that's it.
Changing upwards of 200 logins to use a new email address may be troublesome. Do you keep a list?
I just keep the old GMail for now, and whenever I receive a valid email there, I visit the sender website to update it.
This depends on you remembering your "low-volume important accounts" like government websites you visit once a year, but otherwise, I would not cry if my imgur account got lost or something eventually.