Even if the DNS update is available to an end user, if you're using HTTP2 then web browsers will keep the connection to the old IP address until they receive a GOAWAY frame.
I think it's terrible that the next step up from that plan is $999/year up to 20TB. Consumers shouldn't have to pay in orders of magnitude for storage they "could" but are not yet consuming. I'm not sure what I'll do when I hit the 2TB limit.