I find the trajectory between model railways and stamps sort of similar, in both cases they are linked to a phenomenon that has diminished from the popular view

I find the trajectory between model railways and stamps sort of similar, in both cases they are linked to a phenomenon that has diminished from the popular view quite significantly and as such they as hobbies have waned also. Trains are not really the icon they were 50-100 years ago, nor are people interacting with stamped mail anymore. Ham radio is sort of another hobby that kinda falls into the same category, although maybe for slightly different reason? But there too, just talking to random/local people kinda lost its luster; people barely even make phone calls these days anymore.