I doubt this is the cause. Certain hobbies just grow and shrink. You could get plenty of social media photos photos of lawn bowls for example, but that’s still an aging audience.
As for the others, padel is far far far more athletic than pickleball (and paddle tennis for that matter), and I would argue even more so than tennis. I grew up playing tennis and I love it, but padel is more finesse and also scratched that itch of learning a whole new sport. I learned it in the UK 3-5 years ago, and I do very much miss it. Literally I think there is one court in all of New England, it is crazy how much of a not-thing it is considering it was invented in Mexico.
It would be interesting to compare Florida residents with those elsewhere on the east coast to see if they are actually preserving more of these things than we think.