Obviously the hypothetical wouldn't happen. But let's say Geno did unexpectedly have to leave, possibly as an unfortunate result of health issues. I do think that, if given a choice, Geno will announce at some point that a given year will be his last, and he'll work with Warde (or whoever is Athletic Director by then) to map out and execute and optimal transition plan. However, if Geno's health forced him to leave abruptly, Chris Dailey would be immediately assigned to the position of interim HC until a permanent plan was in place. And mark my words: if she did coach UConn to even one national championship while Stewie's on board, she would be the permanent HC if she wanted to be. I don't know how long she would coach, but my guess is that, if all of this happened now, it'd be 10-15 years.
Bottom line, CD would have the personnel capable of winning the national championship, she would know how to coach a championship season, and she'd deserve the credit for her role even before she became interim HC.
Meanwhile, I can only see an alumna being the next HC if it's part of well-conceived and well-executed transition plan. If there's an immediate need to replace Geno, it HAS to be CD, at minimum on an interim basis. She's been Geno's right-hand woman since 1985, whereas Shea's been a coach since 2008 and Marissa since 2009. There's really no comparison. CD helped Geno build a national champion from Ground Zero in 10 years, and she helped him forge a dynasty from 1995 on. She gets enough of the benefit of the doubt to have an immediate crack at it, in my view.