Unfortunately, it’s hard not to see a pattern, here, introducing spinoffs of CW shows without much potential and less representation (Superman and Lois, Painkiller), canceling the “host” series that Netflix has a contract to show, and (I assume) hope it pushes people to HBO Max before AT&T needs to admit that it’s a failure that still can’t even get HBO subscribers to bump over.
At this rate, it’s hard to imagine Flash or Legends of Tomorrow hanging on much longer, even though the most obvious spinoff characters of those shows have either been fired or written out. It’s not like their ratings are so different, if that’s the excuse.
At this point, though, Black Lightning is the only show I think I’ll really miss. The show could be uneven, but with the exception of this past season’s attempt to overhaul Flash (which COVID-19 disrupted, so we don’t know how well it worked, other than showing that Candice Patton can easily lead a show), it was the only Arrowverse show that was trying to do something structurally different for each season, and its willingness to confront real issues (instead of raising and ignoring them on Supergirl) definitely made it the most important of the shows.