Hmmm, interesting topic! Some thoughts.
Fist, the word "spoiled" brings to mind a person who does not appreciate what he's got. Most model train entousiasts probably DO appreciate what they've got. I'd say people are becoming more critical and they demand more value for their hard-earned money. Nothing wrong with that, I think.
Second, define "progress". Yesterday I put a little '60s loco on the layout that literally had not been out of the box for decades. A little drop of oil here and there, and within minutes it was on its merry way, smooth and strong, as if it had been bought new yesterday. In terms of detail and being a completely accurate miniature of the real thing, by today's standards it is a failure. On the other hand, of the 8 new, digital, it-can-do-everything-but-walk-the-dog models that I've bought since 2008, 3 were faulty and had to be repaired or replaced. But they sure were fantastically detailed. So, what is "progress".....?
To me, it seems like the new ones are awesome to look at but you're lucky if it functions as promised and if it KEEPS functioning as promised (I don't see myself replacing the motor in my new BR23 steamer, but I can fix ANYTHING with the old models, with minimal cost, time and fuss). And with the old ones, they're not a true representation of the real thing but they always work, decade after decade.
So, it would seem that you have a choice between "simple but reliable" or "complex but fickle". However, and I may be the only one who feels like this, the old stuff has another redeeming quality that the new stuff has not: charm. The old "Tischbahn" approach to model railroading in the '50s and '60s presented a fairy-tale reality, not actual reality, but to this day when people see an old Märklin Tischbahn complete with tinplate models, signals, metal station buildings, etc, they melt. And I think it has to do with the possibility that those old models present a world that people might long for, and the fact that it does NOT look like the real world may be the key factor in that. At least, that's how it works for me.
As a collector, for many years I focused on the old stuff, the Tischbahn era. Only a few years back, when I saw beautiful models appearing in the catalogue again, did I start buying newer models. I love them both for different reasons, but if I had to choose then I'd choose the old ones.
Will the current line of models wow people 30 years from now? I doubt it. Will a 3015 wow people 30 years from now? I'm sure of it.
Märklin is capitalizing on this by offering replicas of old models, complete with period-correct packaging (Le Capitole, V200, E03). Smart move.
So, to close off, back to "spoiled". I think collectors are spoiled by definition. I mean, if you have enough time and money to spend both on things like stamps, paintings, old cars or model trains, and if you're worrying about minor roof details of a H0 loco while the vast majority of the world is only worrying about life's basic needs of food, shelter and security, then, yes, we're all spoiled. At the same time, I try to be very grateful for what I've got.