>WTF is the definition of legal person at this point?
Considering that legal personhood is granted to corporations (literally a piece of paper with an official stamp on it - that's what a "corporation" in fact consists of), with no material existence, and "his" decisions made by a bunch of other people who all own a bit of "him", the word has been meaningless for decades.
I don't really see this as causing any major problems - at least, relatively speaking. If this is opening a can of worms, then granting personhood to corporations was a bucket of snakes, I think that remains a higher priority concern.
If a completely abstract entity with no mind at all can be a person, why not an actual living being with a mind that - in IQ tests have gotten scores comparable to young human children (which makes them rather smarter than the average CEO mind you) ?
In the end though - I see more interesting things from this, our days as the only truly sentient beings are numbered - sooner or later there will be others, whether it's highly advanced AI or extra-terestrial life, the day will come when we have to consider what does or does not get human rights like freedom of movement, what we can or cannot legally enslave.
We may as well get some prescedents set and test cases happening, it will be valuable in future.
While we're at it, maybe it's high time we challenge the assertion that a completely abstract legal fiction belongs on that list, or else take it to it's logical extreme. If corporations are persons - then share-holding is slavery and should be banned.