Look what happened to basketball recruiting at Michigan since those glory days of yesteryear:
2013 Recruiting Class: This group was ranked #11 by 247-Sports. That's a good enough group to build a successful program if you can score this high every year.
2014 Recruiting Class: This group was ranked #27 by 247-Sports. That would be like an "inbetween recruiting year" for Tom Izzo. You can survive with classes like this, provided they are surrounded by better groups.
2015 Recruiting Class: This group was ranked #106 by 247 and was unranked by Rivals. This is a "dead-class". You really can't have this happen more than once per decade in a successful program. And you need to follow it up with a super-haul the next season.
2016 Recruiting Class: These guys just signed last November and got a ranking of #25 by 247-Sports and #28 by Rivals. It's another inbetween-class, not a huge problem by itself, but look at the ranking of the previous group. The only way a program could sustain success with two or three groups like UM has recruited would be to score a Top Five class the following year.