Sort of long post incoming:
I've recently seen some comparison between the CW shows and the Marvel Netflix universe, and basically how the Arrowverse is kinda outclassed. However, I think such a comparison is misguided, sort of like comparing apples to oranges, or more specifically, like comparing broadcast to cable. Now, Netflix isn't really cable, but streaming services appear to have similar leeway in terms of content. So, on both streaming and cable shows, you can show cursing, nudity, graphic violence, and basically more mature content. This, in contrast to broadcast shows, which are subject to regulation by the FCC and can't show those things. So, unlike Charlie Cox or Jon Bernthal, Stephen Amell and Grant Gustin can't really curse too much like a normal person would, or be shown in graphic or obscene situations, or act in any sort of way that'd be deemed too mature.
In other words, the CW Arrowverse shows and the Netflix Marvel shows play by different rules. It'd be more apt to compare the Arrowverse to Marvel shows on abc like Agents of Shield or Agent Carter or...Inhumans. But that got me thinking. As we all know, Time Warner is the parent company of WB and therefore of DC Comics. You know what else Time Warner owns? HBO. You know, the HBO that is a known provider of mature and quality content like Game of Thrones, Big Little Lies, the Wire, Oz, the Sopranos, Six Feet Under, etc. The HBO that almost always cleans up at the Emmys every year. That HBO.
So, why doesn't Time Warner decide that it might be a good idea for HBO to make some series featuring DC characters. That way, they could be as mature as the Netflix stuff, just as gritty, just as grown up, and likely just as good. Let the CW shows appeal to their audience, and for those who want a more mature take, make some HBO series centered around classic DC characters. Imagine what Nighwing or Vigilante or Etrigan would look like in an HBO DC-verse like Marvel's Netflix universe. Imagine an HBO Lobo miniseries. They could even set it in the same continuity as the DCEU movies...if they wanted.