Trump should go one better - he should decline to participate,
but he should announce he will live-stream replies to all “debate” questions online on YouTube. Their servers can likely handle the traffic. His commentary on the questions as well as his own answers would serve to highlight the mediot bias and give him unfiltered advantage to answer all the questions, as well as comment on the other candidates.
Which do you think would have more eyeballs, the CNN transmission or the Trump stream?