I doubt he will sell very quickly, its completely possible he will wait until they update and see what happens with steem as a whole. I wouldn't dump something just because i left something it could be a huge mistake so its best to take a step back and watch in his case.
Unless there is more going on then well lets ride this ship to the new mother land or to the bottom of the ocean.
We will never be sure what is going to happen next, and I saw a lot of people powering down. This can be crucial for a lot of people, but it can be also a good time for others to accumulate more steem!