Can I still log into Netflix with my email and password after my Google account has been deleted?

It didn't happen to me, but it would still be important to know if that happens

Yes then you can do a new acc with the same email. But you can also register without the email being there

Yes, but no confirmation emails and such. It is possible that your email will be used by someone else afterwards and so it's not that nice in itself

Yes that is still possible.

So you should change email directly

Beautiful