The reasoning was that:
The networks were reluctant to make a fanfare of this miraculous picture-on-tape invention is that they have made the "live" element a big talking point for a network's very existence.
If all shows are to be put on tape, the copies can be bicycled around the country to the various stations like film. So who needs a network then? There are other complications, too-as-for example which craft unions have jurisdiction over something that is neither "live" or on film? What I'm waiting for is an automatic home TV tape recorder which will record the shows, and which I can play later at my own convenient time.