I think the Sinclair diginets (Comet and Charge!, in particular) have longer legs than the Nexstar networks, based on the strength of the content each network airs.I would add a few more networks to that list: Buzzr, which like Cozi draws from a library owned by the same company as the channel (Fremantle); Antenna TV/Rewind TV, which are established concerns with viewer recognition and owned by the same company (Nexstar) as many of the stations that run those two networks; and the rest of the Weigel (MeTV) networks, especially H&I, Catchy Comedy, MeTV Toons, and Movies! since they operate on sheer volume of focused programming with a huge library to draw from and have wide carriage.
I also feel like Fremantle is underutilizing BUZZR. They're running their B-game show titles like "Password" and "Classic Concentration" into the ground. They have better shows in their library they used to run when the network was new, but the only one that seems to be airing these days are the many variations of "Match Game."