I understand the desire and passion to win, and win now, but at this point I think it would be very damaging to the institution to get rid of Riley.
NU has already had 5 coaches over the past two decades. This revolving door has weakened the program substantially: if a fan does not feel they can become invested in the coach, they cannot really become invested in the team, at least not significantly. We should not add yet another coach to the list unless it is absolutely and most definitely necessary. Would Nebraska still be Nebraska had this revolving door mentality been in place during the 80s when there were many calls to get rid of Osborne? I'd argue no.
Riley is a very good ambassador for the program, somebody that the fan base, the media, and potential recruits can connect with. Let him finish building the program the way he feels it should be built. Either the wins will then come, or it will be apparent that they will not, but don't drop him now. My 2-cents.