So lets be real here. Riley could take more walk-ons, but we've had multiple folks from people who attend practice to former coaches/assistants say that the roster size is about as big as it should be given the limits in the number of stations you can run.
Arguably a coach who is better than Riley will be a net detriment to walk-ons. We've had several folks note that we have too many walk-ons on scholarship because we don't fill them all up, which is a detriment to our overall talent level. (Bad for NU, but a good overall thing for walk-ons).
It was only a year or two ago, that Nebraska and Iowa were 1-2 in the number of walk-ons in the two deep.
The fact that that we don't have 19 or whatever walk-ons in the NFL like Wisconsin probably speaks to the fact that most of our walk-ons haven't been all that good.
It would help if folks would define specifically what they want from the walk on program. Do they need more game snaps? More scholarship opportunities? Do we just need to take more of them to "lock up the state" even if we can't actually coach them?
Just saying "we need a better walk-on program" is not enough.