Of course 1972 shows would fail in 2019*. I'd also wager a fair number of shows from 1952 would have failed in 1972. And people who grew up on the crooners and standards might not have cared for some of 1972's top songs....Heart of Gold, or perhaps Backstabbers. Perhaps they would have liked My Ding a Ling by Chuck Berry, but I digress.
Entertainment has been evolving since Og first banged two rocks together back in the cave. Beethoven might have been flamboyant in his day. And don't even get me started on Elvis and that hip swivel.
*Assuming the shows were presented "as they were." Price, circa 1972, of course, was a radical departure from the earlier version. With some facelifts over time and move to be more modern, the same basic show is still at it four decades hence. From that same general era (plus or minus), Let's Make a Deal, Pyramid, Match Game, Family Feud and To Tell the Truth have done quite well. Wheel of Fortune has rolled along continuously for decades, and then there's Jeopardy (certainly keeping up with technology, but I'd be hard pressed to classify it as flamboyant).
Entertainment--and fashion, food, decor...etc.--has "had" to evolve because successive generations have put their own stamp on the world. We learn more, we discover new things, we experiment with new approaches. Some of it may be "flamboyant," but some of it is far from it.