I don't think cable TV will be gone and they are still necessary if you can't get local channels with antenna.I will say I'm not a "cable is dying" person, because I don't think it will, in theory people have thought radio was dying since 1950, so...
That why I believed la carte concept is flawed and have more subscriber pool make cable channel more affordable and yeah, you are right about networks forced cable and satellite TV companies to include all main channels. No ESPN = No Disney Channel. It looks like Disney is willing to make a dent by allow Spectrum to offer Disney Channel without ESPN but it is very unusual.That wasn't a cable company reason, that was a producing company reason. Disney was a big example, they made it where you can't have Disney Channel , ABC(in 8 markets), and other channels they own without ESPN (the most expensive cable channel before you get to the premiums) . They connected it. It would also obliterate smaller channels (depending on you feel about that) to go a-la-carte. Disney wasn't the only one but they are the ones that really have the biggest fees to cable companies. Cable companies couldn't make a-la-carte. Some like Spectrum and Comcast have started offering carve out services for smaller prices, you'll notice the sports channels aren't there, and you'll notice Disney's networks aren't in there. There's a reason for that. Also cable companies were subsidizing things, the channels you don't watch but still have were still getting money so people who did watch them could still watch them. If it was a-la-carte the prices would be higher, even ESPN. That's why DTC ESPN will be in the $30/mo per subscriber range versus the around $12 ($9 just for ESPN (1) through cable.
Sport leagues like NFL want prices to be a higher, so that why ESPN is getting more expensive over time.
Yes, I felt that TV stations don't bother to take advantage of ATSC 3.0 and FCC isn't bother to do transition like they did with analog to digital in 2000s. There is strong public pressure to push FCC to ban on DRM but they rather to require all stations to carry ATSC 1.0 and it is likely that they will push further after 2027. I'm not sure if FCC would reconsider if association agrees to eliminate the DRM. Unlike cable TV operators, TV station operators don't know to do with digital subchannels and their quality is always more crappy than cable channels.I know ASTC 3.0* is around and stuff, any maybe that'll make the bandwidth better, but at this moment there's not that much room and would be a lot of awful 480i widescreen broadcasting kids channels, which wouldn't be fun.
There are some organizations are calling for complete elimination of broadcast TV and free up all spectrums for mobile carriers, so it means all local stations would have to transition from airwave to internet delivered local channels. Those are seen as nonstarter and it is unlikely.
ATSC 1.0 has DRM that is broadcast flag = it means recording is prohibited but it is rarely or never used. ATSC 3.0 is just next level with tons of DRM and they can block specific turners. If turners don't support DRM or outdated, so they wouldn't able to receive channels that are DRMed.*also ATSC 3.0 would give broadcasters the ability to put things behind a paywall, if they wanted to, some stations have used it to already making recording harder. Again at current time ATSC 3.0 turners are pricy.
FCC gave broadcasters a hard time so they can't shut ATSC 1.0 down or reduce HD to SD since broadcasters just want move to ATSC 3.0 quickly without consider about viewers who don't have access to ATSC 3.0.
ATSC 3.0 allow to expand the coverage but it is unlikely for stations to consider because they want you to subscribe cable or satellite TV to receive local channels, so they can collect $$$$ from retransmission fees.