Here's where I think your argument falls downs.
1. OTA has been around a lot longer as analog. Far fewer than you are thinking can get a reliable digital signal. In Eastern Ct. it's near impossible to get all four networks OTA reliably. When it was analog, I got them all, one barely. Proof? I qualified for one channel when it was analog for being in a white zone. I now qualify (and get with AAD) all four.
Even in Florida, it is hard to get one of the four networks since they moved their antenna. (CBS - WTSP) I had to get a rotor and pre-amp for my inlaws just to get it. Even at that, when a plane goes between them and the transmitter they lose the signal for a few seconds. During higher winds when the antenna moves a little, they lose the signal. This isn't the days of analog, when I could get most any channel. There is no way people in apartments with any distance from the transmitter is going to get a reliable digital signal. If you are willing to spend much more than in the past, have a huge antenna with a pre-amp and probably a rotor, yes many can get locals. Just throwing up an antenna, no. In many less populated is where signals did not reach, but those areas are not as sparse as years ago, almost anywhere. Things have changed, where once signals not reaching an area meant a relative few not getting it, now those areas have far more people. Add to that the digital signal not reaching where analog did, and there are far more than I think you are giving credit to that can not get the affiliate signals.
2.Lets ask the networks, if they are willing to take all four networks off cable and Satellite and go back to pre-cable/satellite days. Millions would not or could not put up an antenna, or even get the signals. I'm betting they do not feel as you do that networks don't need cable/satellite.
3. That does not mean I do not watch network programming, I do, but nowhere near as much as years ago. It's been replaced with programming I like better, on USA, or TNT, or History, EuroNews,etc..... If given an ultimatum, I could only have one or the other, I would keep satellite, drop networks. With the advent of internet news, don't need the affiliates as much as in the past for that either. I do prefer local network news, but could learn to live without it.