It wasn't an EO it was a change in federal regulations. Under federal law they have to do the whole rigamarole all over again if they try to revert 41P. The comment period, reviews, etc...
I do not think there will be much effort to change it. Most folks like it better and the loopholes to get around it are getting well known.
A bigger effort will be to remove things from NFA altogether, - silencers, then SBRs, etc.