Out of the millions of people that tune into most of those shows, I am sure not even 1% would buy high end action figures. This board is very much the minority.
I don't think thats all true, this board is just the tip of the iceberg and there are 10's of thousands or more collectors out there that don't visit this or other forums. I will agree that high end action figures are not found in most homes but nearly all homes have some kind collectible nick nac's or toys of some sort.
I don't think this hobbie will pass on to the next generation though cause for most kids now its all about games and phones so the connection to action figures will likely not turn into an obsession like it has for people who played with them in the 60's though the early 2000's.
All I know is I really want a good sixth scale walking dead collection and sideshow is the best company to make that line happen imho.