Kristof wrote an op-ed in the NYT today that's being much-discussed in the journosphere. He says that journalists failed by giving Trump so much airtime. But he didn't say what to do about it. 

I certainly can't say all of what's needed, but I'd like to call your attention to the need for new stronger rules, or don't have debates. 

I outlined some ideas in this piece written on March 17, I think it might be worth a read. It begins thus..

We never had a rule that you couldn't interrupt people in a political debate because most people running for the job understood how serious it is and while they did interrupt each other, it never became a huge problem the way it did this year. Likewise we never had a rule saying candidates couldn't call each other names or make personal comments about their bodies or mannerisms. The thought never crossed anyone's mind because it was unthinkable that anyone running for this job would have so little respect for it.

And continues on from there...