It's fair to divide the history of cable TV into two broad swaths - the "community antenna TV" (CATV) era that indeed began as early as the late 1940s in places like the Pennsylvania hills and the Pacific Northwest where would-be viewers didn't yet have any service directly over the air, and then the more modern era of multichannel cable-only programming that started in the mid-1970s and exploded at the end of the decade.
In that first era, CATV was mostly limited to rural areas and small towns, since urban areas and larger communities already got their TV over the air with anywhere from 3 to 7 channels and had no reason to pay just to get those same networks.
That's what made Turner such a revolutionary figure. He *did* leverage new technology - first microwave relays and then satellite delivery - to make WTCG a regional and then the first national superstation, as much by trial and error as anything else. And then he took a huge financial risk and a technological leap with the launch of CNN. Without CNN, the development of other "all one thing all the time" channels, whether MTV or the Weather Channel or BET, might not have happened as quickly. It was absolutely because of the risks Turner took that cable systems began to have more than the "big 3" and maybe HBO to offer subscribers. It was because WTBS (and ESPN, too, though a few years later) became a must-have chapel that cable systems all installed satellite downlinks by the late 1970s, which in turn opened the spigots to dozens of other new channels.
And it was because of all those new channels that CATV became modern cable TV and became something that people in cities and suburbs suddenly wanted to have, which in turn made cable a truly national medium in a way that CATV never could have been.
It all certainly could have still developed without Ted, but his unstoppable energy and his willingness to try just about anything to grow his networks made it all happen much more quickly than it might have otherwise.
The man deserves every bit of of honor and respect he's being shown in the industry today.