uhh... Post WWII was one of the most gangbusters periods in our country's history. The economic juggernaut that was built out during the war, combined with being on the 'winners' side of WWII lead to an era of prosperity the country had yet to see before.
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Sure each generation has the new things that the old looks down upon... but even major revolutions like TV pale in comparison to what media and the internet has changed in the last 20 years. The smartphone changed in 5 years what took computers nearly 50 years. Media outlets have gone from the dozens, to literally the tens of thousands.
And videogames/etc never lead to mass shifts in social tolerance, how people acted towards each other, or how WIDE demographics spent their time. Videogames were the habit of kids... Internet/media absorption hits across all age demos.
And you're off by a significant bit on your years. EPCOT was being conceived in the 70s... MTV was 81.. Robin's TV show was '84. EPCOT started the balls out push in '79 but had been in development prior (with a down period in the middle).
Society is on a slide that is unlike any change seen since the 60s when the social revolution pushed back against the establishment. But this change isn't nearly as healthy...