I have never heard any body say "oh, and by the way: Autothrottle TOGA mode won't work". That would be because nobody has thought of it before.
Nope, not true. This 'problem' was recognised many years ago. We have a 'Rejected Landing' procedure in our 777 FCOM that covers this scenario. It clearly states "TO/GA switches are inhibited" and "Autothrottle is not available". We regularly train for it in the simulator. If Emirates does not have the same procedure and/or doesn't train for it, then questions should be asked.