Given that many of the newer, even popular shows are being exclusive to streaming services like Netflix, Hulu, Disney+, etc, had been on network TV for one season and then gets picked up by streamers, and the fact that NBC is considering cutting back programming hours like eliminating the 10pm slot altogether, I do believe that within the next decade or so, broadcast networks will eventually stop investing in original programming and become more of a syndication service like MyNetworkTV showing mostly reruns, even more live sports. A long time ago, way before streaming media and also before cable became commonplace, all of the original scripted programming(even superhero shows) can be easily found on network TV. Back then, even Fridays and Saturday nights have shows that were a ratings success, including Dukes of Hazzard and Dallas, and ABC's TGIF comedy blocks. Times have changed, and recently, they become "graveyard slots", with Saturdays preserved for mostly live sporting events. I wouldn't be surprised if one of the networks eliminates its Saturday night programming altogether.
With the CW being sold, and many of its popular shows are either cancelled or given their final seasons, this is a pure example on how network TV is trying to survive in the age of streaming media. This applies to the cable networks too. And finally, it's now becoming more rare for network TV to run made-for-TV movies, most of which are now being exclusive to streamers.
If this trend continues, broadcast TV will eventually disappear.....