Trying to pin this team's troubles on any one specific area is a huge mistake. There are so many things that need to be fixed right now, but it's all cyclical. If the defense doesn't give up big plays and touchdowns, our offense can run its own tempo. If our offense can run its own tempo, Taylor doesn't have to throw the ball every play (though there have been situations where Taylor didn't have to throw the ball every play but was called on to do so anyway, which brings Beck into the fold). If Taylor doesn't have to throw the ball, he won't throw interceptions. If Taylor doesn't throw interceptions, our defense spends more time resting on the sidelines and less time on the field sucking wind. If our defense spends more time resting on the sidelines and less time on the field sucking wind, it's easier to make stops. If it's easier to make stops, our defense won't give up big plays and touchdowns.
Now, granted, it's not always that simple. Sometimes our defense makes boneheaded mistakes and gives up big plays anyway. Sometimes Taylor makes boneheaded throws in situations where the defense isn't even sold out on pass coverage. The fact is, it's easier to play well when your team has momentum, and if one side gives up the mighty MO, it can be difficult for the other side to get it back. Great teams can, but the Huskers aren't a great team right now.
Yes, Taylor's part of the problem, but replacing him won't fix the problem if the other parts aren't addressed. It'll only make us start calling for replacements further down the depth chart.