This is a bad move for Trump in my opinion. The optics are bad all around. Yes, most rational, thinking voters would consider the debates pretty much worthless political theater. But rational, thinking voters are in the minority.
Firstly, this decision makes Trump look like he is willing to spread the beer virus by demanding a live debate. Yes, rational people know he wouldn't spread the virus, but there are too many irrational folks that he needs to persuade. He just gave them up.
Second, this makes him look like he is afraid to debate Biden. We know this is not the case, but the perception of many low information, emotional, and single-issue voters will be negative. These are people he needs to convince to vote for him, and he just kissed a large number of them off.
Trump lost much of the influence he might have had on still undecided voters and any Democrats that might have been thinking about voting for him. His campaign is at a point where he needs every possible vote he can garner. His already slim chance of being re-elected is growing slimmer by the day with decisions like this.