Plus the Arrow-verse is already compromised of four shows playing four nights a week.
Despite the fact that Arrow, The Flash, Legends of Tomorrow, and Supergirl are all tagged in Johns post, so are DC shows on other networks like Gotham and Lucifer.
It’s too big of a job to try and narrow down the dozens upon dozens of different characters this potential show would focus on, but there are some options.
Adding one more to make an entire weeks worth of television might be one step over the line into overindulgence; one network can play only so many superhero shows.