You have to remember color came out with the country still in the Great Depression. Then came WWII and that limited resources. WWII was uniqure that it was really the only time people as whole got together and looked down at anything that might be viewed as hurting the war effort.
Even if it had no basis in reality. It would come back with “Why did you spend that when it could’ve went to purchase war bonds.”
Plus radio was providing huge competition to the movies.
So you have people who weren’t rich, had lost pretty much everything and trying to get bck on their feet, and now WWII.
It wasn’t after WWII when the economy was recovered and people could seriously get into the business of improving technology. Then the studio system collapsed, so that set it back a few years till they could work that out.
TV was a different matter. TV was rushed out and it was a mess. The FCC froze allocations and that was supposed to take months to work out, but instead took years. This left some cities with only one or two channel. TV was in its infancy and the emphasis was getting the product out there, not necessarily producing quality.
Movies were dead set against TV, some threatening to boycott actors who appeared on TV shows, radio was also against it.
So by 1960 movies had reorganized from the studio system, there was no shortage of materials (real or just preceived), the economy was good and most importantly TV and Movies had reached a “gentleman’s agreement” where both realized they could survive.
TV was still coping with a lack of channels. In 1964 UHF tuners were made manditory but even then it took a decade (or more) for the old TVs without UHF to wear out and be replaced.
People are now much more comfortable with changing formats then they were then. People accept now that you buy something and in five years a better format will come along and they’ll have to repurchase.
All these things in their own way add up to a simple thing: delay after dealy 