I have always said the biggest thing in a coaching change is the new staff finding a QB who fits their system. You see all the time on every level of football, when a college or NFL team fires a coach, they generally look for the opposite with their next hire. Whether its a defensive minded coach replacing an offensive minded one or a laid back coach following a coach who got fired up.
What this means is generally you are seeing a completely new offense and/or defense being installed, usually both. Diaco's 3-4 is showing everyone how different players with a different skillset or body type will need to be recruited to fill certain roles. The pro-style offense that Riley has wanted to install since he got here can finally be fully integrated. He got to Nebraska too late to recruit a guy in 2015, although Joe Burrow was pursued (and IMPO would have been the starter last year). He hit the lottery with Tanner Lee as a transfer and has recruited two ideal fits to help build the room. Langsdorf can finally implement his offense and have these guys learn and grow into it. If Lee, POB and Gebbia come close to living up to their hype, with the way they are recruiting, Nebraska is going to be VERY competitive for the foreseeable future IMO.
With how the depth chart sets up and the guys they have in the system, if Tanner Lee comes back next year, IMPO Nebraska is going to be a legit threat to win the Big Ten and be a playoff dark horse. So many guys will be back in this defense and youngsters will be stepping up all over the depth chart on both sides of the ball. Diaco's defense will have a huge jump in year 2 IMPO and Nebraska will return basically its entire OL for a 3rd year of starting together. All of their skill position players will return outside of DPE and they have crazy fire power slated to come in next year at WR, along with Lindsey this summer. They lose Jones and Kalu in the secondary, but they have Elijah Blades coming in and along with Bookie, will add another couple studs at DB (already have) in the 2018 class. They'll be brining in a top 5-10 WR and DB class nationally on signing day IMO. Yeah, I think 2018 is going to be an 11-win year with the chance to make noise nationally.