I get what you're trying to say, but to be honest, who would be really be replacing? Boe Wilson is a C- player and Hixson has a pretty limited ceiling. Neither is the caliber of player that starts on a contending team.
I see guys like Benhart, Piper and Banks as positive signs that Austin is starting to get his room where it needs to be, but he's still a year or so away from it really being right. Those three are legit talents, but let's be honest, in a perfect world Benhart and Piper aren't where they are in the pecking order until next year if the line was where it should be.
I don't want to take away from the job Austin is doing. I'm a huge fan of his (IMO he'll be the first assistant on staff to be a HC someday). But I'd pump the breaks on being too impressed with replacing subpar talent like Wilson and Hixson. Frankly, it's what Nebraska has to do to get back to really being a legit player in the conference. It's a positive sign, though, absolutely.