You don’t have to subscribe to Adult Swim. If you still have cable, its part of Cartoon Network, which is typically a basic tier included in cable. If you have cable service, or a family member does, you can log into the Adult Swim website with the sign in credentials for the cable system and watch the show it, it will prompt you for that the same way you are prompted to log into DCUI to read a comic book.
There is a way to buy a season pass on iTunes (and other services that sell full seasons, like Vudu) and those look like they are dropping (at least the iTunes ones) reasonably at the same time as the cable broadcast would be in your time zone, but it would be difficult to expect to do that for a live WAL.
I don’t think DCUI needs to serve the interest of every single person here, even of smaller slices of that pie, such as every single person interested in animated Superman, or even 100% of every single DCUI community member with even the remotest passing interest in My Adventures With Superman. Because that’s going to be impossible to do.
The problem with this, as far as I understand it from other situations that are not specific to animated or live action WAL, or specific to Superman content, is that - at the moment, we have far too many clubs and groups and events set up for community members, some of which don’t necessarily have the participation of everyone or not everyone knows they are happening and the site is not able - due to other, technical limitations - to allow all of them to be equally promoted.
I agree with the basic statement of your OP post. It’s an important thing and needs far more attention to it paid on a DC specific fan site (not to mention, DC Entertainment run/owned website), even if DCUI is, largely, a comic book reader oriented website service.
Do we need more people? Perhaps, but we also need to be able to have the people running games, quizzes, polls, etc., be able to promote what already exists on the site, which is a concurrent issue. Which has (the promotion aspect) been raised with the site moderators, at minimum.