Not forever, just as long as you support out-of-date clients (either because of cached JS on the web, or mobile apps that haven't been updated recently). Plus,

Not forever, just as long as you support out-of-date clients (either because of cached JS on the web, or mobile apps that haven't been updated recently). Plus, you generally don't want to introduce backwards-incompatible changes to your schema anyway at a certain scale, unless you can afford to have planned downtime, so GraphQL doesn't add anything new here.