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.