Ugh don't even mention an Ambush Bug movie as a joke. Was bad enough he got what miniseries he got in the comicals. Was ok as a guest appearance to annoy main characters here and there but the solo stuff is really painful. Same could be said of Lobo really, but he's at least good in the cartoons.
I'd love if Larfleeze showed up somewhere but it sounds like the Lanterns show is a limited scope detective show.
As far as the butts on seats/streams question - that's a toughy, as they seem to be banking on people wanting a DC MCU and having faith in Gunn to do it. But it seems like he's already trying to bring in analogs of stuff that wouldn't have worked were the MCU not already well established. And really as much MCU weariness as there is now it's not clear either bet is a particularly good one. Whatever is first out of the gate better be leagues better than Gunn's Suicide Squad. About all I can say for it other than 'meh' is it was way better than the other one and at least we got the Peacemaker show out of it. And of course there's the problem of the first movies out of the gate being things he's inherited. Blue Beetle's the only one I'm not actively dreading of the top row of that poster.