Once they've transferred governance to some other entity, sure. That's gonna take years though, they said so themselves. Standardizing a protocol isn't something that can be done overnight, and that's fully their intention with ATProto.

I'm keenly interested in the protocol, but I also question its flexibility as to the content it can be used to post and distribute. That's something we'll have to wait for federation to come to see people start playing with. If it becomes a standard, governed by a non-partisan body, and is flexible to a variety of content types, I see no reason to stay with ActivityPub except that the software's already here.