I don't agree with this. At all. Solich is not responsible for Nebraska football slipping, Steve Pederson is.
Solich's last recruiting class included some pretty good players, guys like Demorrio Williams, Jay Moore, Fabian Washington, Adam Carriker, etc. The year before that it included the Bullocks brothers, Barrett Ruud, Sam Koch, Richie Incognito, Porkchop Cory Ross, and LeKevin Smith. Multiple guys with college football and NFL success. He was also 9-3 when he was fired, which any Husker fan would take this year in a heartbeat. So a pretty good record, and pretty good talent coming in does not support him being responsible for Nebraska's decline like you stated.
With that said, IMO he does not belong in the college football HOF. If they open a hall of very good he has a great case for that though.