Is that speculation or do you know it will happen?
I feel reasonably confident that ignoring MX records would violate some part of the smtp process, and I would be be very surprised if Gmail did this.
I feel reasonably confident that ignoring MX records would violate some part of the smtp process, and I would be be very surprised if Gmail did this.
I had troubles a few years back with e-mail routing from GMail to mail servers for a domain that had previously Google Apps set up for it but was subsequently moved to another provider. They disappeared after deleting Google Apps.
Maybe it's not an issue any more, maybe it was just some weird caching problem, maybe disabled domains are handled differently but it wouldn't also surprise me if they had some system for handling what is essentially mail internal to GMail.
Thinks might have changed in the meantime, but my guess is that Google still sends emails directly for accounts that it "knows" are hosted on gmail and apps and happily ignore MX records.