So one of my buds here at work, his sister is married to Bohl. He has some pretty good stories that Bohl shares from the old days.
I think the idea that the option was dead/dying when TO retired was even a thing on the Solich coaching staff as he shared with me.
Certainly towards the latter end of Solich's tenure, the entire outlook of a "dual threat QB" had changed pretty dramatically. For most of TO's tenure, a "dual threat" guy pretty much knew he wasn't making the league as a QB and could be convinced to win a couple conference titles or maybe even a national championship before he switched over to being an NFL safety or whatever.
By the end of Solich's tenure, you had sort of reverse osmosis, instead of the NCAA trying to copy NFL concepts, you had NFL teams starting to dabble in NCAA vidya game football concepts.
Which means that any of the top flight talented dual threat QB's that NU would want to recruit, wouldn't be faced with a dead end NFL career anymore. They wouldn't be happy sitting in a 80/20 run-pass system where the only chance to show off their arm was on the occasional long bomb to a wide open TE or Wingback. They'd want to play in systems less traditional TO option, and a little more modern spread option at a minimum.
So I do think that staff basically realized that the slow churn from "the system" to "something else" was basically inevitable.