I went with “neigh-sayers” (as a hyphenate) for typographic symmetry. It does not rise to the level of a pun, but I justified it (if only to myself) with my belief that both naysayers and neigh-sayers are full of horse shit.

Or is it horse-shit? ;P

the OED says it’s “naysayers,” a single compound and not a hyphenate. Since the etymology comes from “nay” and is not equine-related, the word “neigh” would have no relation. That’s a common mistake going back to the 1930s, but “naysayers” goes back to the 1550s.