Shutting down GMail would practically amount to shutting down email. It's by far the largest email provider in the US (and probably in the world but I don't have that data). There's no other provider who could take up the slack; if it were to abruptly shut down, a lot of users would simply lose access to email altogether.
At one point AOL was the largest ISP and email provider on Earth too. If gmail died off people would just move to something else. It'd be annoying, but it wouldn't be the end of email
No, that wouldn't happen. Lots of people don't have email through Google, for one. Those people will still use email just fine. Moreover, the people who do use Gmail will simply sign up with another provider. It won't be a big deal.
oh no. what a shame that would be.
I’d honestly expect to see regulatory intervention if they tried this.
They'd generate a huge amount of ill will by shutting it down, and that in turn would likely lead to a nontrivial share of people moving away from Google core products (like search) out of pure spite.