Don,
Where it was as hard to go to town in 1880 as you describe, it probably didn't happen very often.
But, I would not disagree with you that what is commonly thought of as "leisure time" has increased, at least in some sense. But what we call "leisure time" is often filled with activities that require $$$ that then often cause people to work more than they would otherwise (second income, spouse entering the work force). It is just a variation on TANSTAAFL.
You probably are aware of the discussion taking place on "the other stamp forum" about declining circulation in philatelic magazines versus the influence of
ebay on stamp collecting. Declining circulation might suggest a declining interest in the hobby. But
ebay has undoubtedly offset that to some extent. I could be considered a good example. Though I collected stamps in my youth, I never got seriously into it until 2003 (when I would have been 56 years old). And by then
ebay was a significant factor in developing my interest in the hobby. I doubt I am a one-off example. But has
ebay added to the number of people in the hobby, or merely slowed the decline in the number of people in the hobby?
This same discussion takes place in other hobbies. I resumed an adolescent interest in ham radio in 2006, and the same discussion/debate is taking place there. In the case of ham radio, I'm active in a local group, and in the decade I've belonged to it there has been no noticeable increase in its size. Monthly meetings are about the same size as they've always been (if not a bit smaller). From time to time we get new, younger hams joining, but I look around and I can see faces missing too -- older ones who were active when I first joined who are not any more because of age or passing. We're doing well to hold our own, treading water so to speak.
All of this discussion has been casual and largely anecdotal. No one has come up with irrefutable evidence one way or the other. My own
opinion is that in total numbers the hobby is probably just holding relatively steady -- like my perception of ham radio -- but that in terms of total population, it is declining
significantly. Modern culture and technology keeps creating new diversions to the things that used to be a common way of using our leisure time. People do not read as much as they used to. They do not study history as much as they used to. Attention spans have shortened. These are all things that classical philately requires -- reading, knowledge of history, careful attention to detail, etc. We do well to hold our own, if we can, in the face of all that.
Basil