It doesn't matter. I recognised years ago the "Nice guys get all the AI" fallacy. If some organisations agree to stop, others won't and some of those don't care if they see the world burn.
It's almost a certainty that countries with the means to do so will continue this research, if not in public then in secret. They'll see it as a royal road to nearly infinite riches and power. At the same time, letting another country take the lead will be seen as an unacceptable risk of ruin.
I really don't see AI research halting. Slowing a little, maybe, but I'm not sure if slowing it down a little and driving it underground will help.
I really don't see AI research halting. Slowing a little, maybe, but I'm not sure if slowing it down a little and driving it underground will help.