Hi Jamie,
I see your point, it is easy to confuse the link to the post with the unsubscribe link.
I think the accidental clicking of the unsubscribe link could be mitigated by putting more white space above it in the forum notification template and maybe making some kind of heading like:
** No longer wish to receive these notifications? **
above it.
I will do that for now since it is the easiest solution.
Best,
Joe