IMHO, if that happens, it may not work to Biden's (or CNNs) benefit. In fact, it may do the opposite.
I hope that does happen. And I hope Trump reacts by declaring the “debate” a fraud and walks off the set. Thus putting an end to these Kabuki TV debates forever.
I think this is exactly what will happen. Everyone here is second guessing Trump should wait and see what happens. The live comparison of Trump speaking and Biden time will be easy to determine. They will try every dirty trick in the book to make Trump loose his cool. If he doesn't, he wins regardless of the debate. It will be obvious to everyone how biased and crooked CNN is.
Yes, Trump will for a time suffer being blatantly put upon by the moderators. Then, he’ll let them have it with a memorable oath, outburst, objection, condemnation, insult...something natural, incisive and politically devastating.
The moderators will suffer a massive dose of embarrassment and will soon thereafter be criticized for “giving Trump a forum”.