if the osu job surprisingly comes open he can always quit and take it.
nd is one of the prime jobs in the sport. if he waits too long he could end up stuck at cincinnati, where he would be one or two injuries/bad seasons away from obscurity, and he's about to be increasing his competition level by going to the big 12. strike while the iron is hot.
unless he knows day will be leaving.
day going pro is always a possibility. there are plenty of stupid pro teams out there (bears on line one).