People were saying that actually going to the debate was a bad idea for Mr. Nye because it elevates creationism to something worthy of debate. This has been the de-facto policy for several years now.
However, what seems to have happened is the creationists argued amongst themselves in an echo chamber for the whole time, forming crazier and crazier ideas and not getting the pushback from the actual scientists. Now when the time comes for real debate, they don't even realize how ridiculous their arguments sound. That's how you get such an embarrassingly one sided "debate" like last night.
Also, of course it is impossible to change Ken Ham's mind. That's what belief is: maintaining your conviction despite any and all evidence. This is the message you get over and over in the Bible, that you must maintain faith no matter what. As far as Ken Ham is concerned, Bill Nye was sent by the Devil himself to test his resolve.