To clarify Brooke, I agree it is rare to achieve a NC. What should a LSU program shoot for? What should a Michigan program strive for? Would a OSU, Michigan, MSU...USC be happy with an 8 win season and an invite to the cheddars bowl? I doubt that!
You are right -- they wouldn't be happy with 8-win seasons. But here are Miles' last 10 seasons. Only 2 of them are 8-win seasons. Only 4 of them are 8-9 win seasons.
2005 LSU 11–2, W Peach
2006 LSU 11–2, W Sugar
2007 LSU 12–2, W BCS NCG
2008 LSU 8–5, W Chick-fil-A
2009 LSU 9–4, L Capital One
2010 LSU 11–2, W Cotton
2011 LSU 13–1, L BCS NCG
2012 LSU 10–3, L Chick-fil-A
2013 LSU 10–3, W Outback
2014 LSU 8–5, L Music City
2015 LSU 9–3, W Texas
There is randomness in football as well as talent. The last time Miles had a couple back-to-back 8-9 win seasons (2008, 2009), the next four seasons were quite good, with one of those being playing for national championship.
Bo Schembechler and Lloyd Carr at Michigan had more 9-or-less win seasons as a percentage than Miles. Miles had a higher percentage of bowl wins than Bo or Carr.
If LSU doesn't get someone like Briles, it might go through a couple of coaches nowhere near as good as Miles before they get someone as good.