Worst case is that he plays like he did in Ottawa and he's a complete suck.
i'm convinced the well in ottawa has been pretty irreparably poisoned at this point. between the penny-pinching owner that can't stop saying dumb things publicly and the extremely questionable roster/coach management by brian (which was quite possibly influenced by the owner), it seems like it's become a pretty toxic environment.
outside of the miracle playoff run, there's been way more "bad" than there has been "good" the last few years there. a change in scenery would do a lot of their players some good, and i think wier is chief among them. there's arguments to be made about "mental toughness" and how even if he does turn his game around he's proven himself soft...but there's an even bigger argument for "our LD is an absolute trainwreck and he'll be an extremely cheap 25 year old reclamation project that could reasonably prove himself to be a quality 3rd pairing guy."
i think his ceiling is considerably higher than that, for what it's worth, and he'd be entering a locker room with a lot of strong voices and good leaders (that feels good to type). there's also a lot of positivity surrounding the franchise right now, so it's basically the polar opposite of ottawa the last few years.
this is a lot of words to essentially say "if he can't make it work here, he's officially broken, but i don't think he is." some of this hinges on gut feeling, but i think he's going to make whoever signs him pretty happy.