Agree on Frost needing to make it a moot point.
The depth that has been "built" is somewhat dependent on who they could get to take the job. The WR, outside of Toure still struggle to get separation, the RB still struggle to get yards after contact, the OL still doesn't open many holes. There will be 4 scholarship QBs, 2 will be athlete playing QB and 2 will be throwers who have some ability to run. Barring injury to Martinez, only he will have any playing time when the game is on the line. That is assuming he doesn't leave if Frost is let go. So you will need a transfer QB to run the show in 2022.
The defense has some talent and depth. If I could play antirowboat's roll of AD for a while, I would hire a defensive minded head coach. Basically do what OU did with Stoops. Bring in a guy that will get the defense back to nasty, hell OU ran the Air Raid for a year and won a national title with Heupel throwing the ball 500 times per season.
Edit -
The most successful coach we've had since Osborne, that didn't have access to Osborne's leftover players, has been Pelini, a defensive minded coach. At some point, we need to quit making head coaching decisions based on offense. If you really want to level the playing field in the Big Ten and give your team a chance to win nearly every game, develop an elite defense.