I do see a pattern. There are some that engage in wishful thinking and want to believe the movement away from network TV is driven by rejection of liberal idealogy. I don’t think has much to do with it. People hate commercials and will gladly pay $8 a month to avoid them. As more and more people leave cable to Netflix the network producers have to increase the percentage of the cable hour allocated to commercials. Downward spiral. Cable is almost unwatchable because of all the commercials. Then there is people’s rejection of the crappy content but that has little to do with political idealogy.
I'm not saying it's a wholesale rejection of liberal ideology, but clearly a significant portion of those who watch TV have specifically migrated away from the Norman Lear types who spew their agenda.
I believe the migration went from the broadcast networks, including the nightly news to cable. With cable you can kind of choose your philosophical perspective, at least more so than the monolithic broadcast network.
Now, however, even cable is drowning in ads with literally dozens of channels seemingly running nothing but infomercials! Who buys these crappy kitchen gadgets and vacuums anyways??
So yes, I do think ideology has played a big part of this migration, but so too, as you point out, is the utter relentlessness of TV commercials, kind of like what happened, in part, with FM radio.