Day has been ruined by the cheating scandal .. and fake issues like toughness and Chip only fed Days insecurities. If Day stays he needs an infusion of Coaches that make him uncomfortable.
I think Day is just who he is, he hasn't changed or been ruined by anything other than over promotion. He's a QB coach and passing game coordinator who got thrown in to deep end and couldn't swim.
Urban Meyer does not have a stellar track record of developing assistant coaches. In fact, his coaching tree is pretty underwhelming to non existent. It's just the way he was, he won through a force of personality more than anything else.
The next guy at fault is Gene Smith. I know people are trying to create the narrative that he was a program builder but he failed leadership of a large organization 101 when he let an underling pick his own successor without a credible, independent job search. He was sidelined for Urban's hiring, firing/rage quitting and then let the man pick his own successor. Gene fucked this up more than anyone else.
Lastly my thoughts go to us as a fan base/alumni/boosters etc. A lot has changed since 2018. Urban and Saban are gone from the CFP landscape. NIL and transfer portal are here. Expanded playoff is here. Expanded conference is here. We have to let this idea go that OSU is one of 2-3 colossus programs standing unassailably above everyone else. Our brand is top 5 as are the all time results. Our facilities are first rate, our NIL game is strong but seemingly not elite. It's got to be run more like an NFL team now, like it or not. We can't mortgage everything on The Game. It's about winning 10 or so a year to make the playoffs and then taking advantage of those shots (as near as I can tell with my cracked up crystal ball).
We need new leadership that can give the team a punchers chance (50/50) in big games against like talent. The bully that can only over power the most talent disadvantaged opponents is useless to us. It seems nice but it gives us no way to win. You have to have an unsupportable level of talent and even when you pull that off, you are at a game day disadvantage to teams that get more out of fewer resources (talent).
It's more and more going to be like NFL/running a real business. There is no such thing as unlimited resources. Money, and the talent it can buy, are scarce. You must have a coach/CEO/leader that gets the most return on your dollar.
Don't be afraid to start over. You are on a path to worse and worse outcomes. Stopping now and going in any new direction at least has some chance for upside. Staying the course is guaranteed death.
The decision is simple, executing on it will be hard.