Very likely.I think some of it may also be from the way (some) Korean masters talk about old Korean training. I don't know if you've read any of Marc Tadesci's "Hapkido" book, but it's got a bunch of interviews with old Korean grandmasters, and practically all of them complain about how lazy American students are and how when they were a kid they trained for 5 hours every single day on the mountain outside in the snow barefoot etc etc.
But just to point out that there are other reasons that people drop off from the martial arts and do other things; I delivered papers for several hours a day rain, snow, sleet, or shine, on a bicycle in the mornings when I was a kid, cut lawns all summer regardless of the temperature, and rode thirty miles a day, every day, rain, sleet, snow, or shine, because I wanted to compete in BMX at a higher level and later had visions of competing in the Tour De France. I practiced my "karate" everyday indoors for about a half hour to an hour a day. All that on top of school and a part time job.
By Junior year of high school, I had proven that I could defend myself, which was why I started taking "Karate" (it was TSD for a year and then TKD for a couple of years, and then Shotokan in high school) in the first place. I never tested for a black belt; I was able to defend myself. I had reached my goal. I stopped formal training regularly about two years after I got out of high school (I was back in TKD by then), but I attended simply to train. I wasn't interested in a black belt and I had gotten into fencing by then anyway. Cycling was a huge part of my life and eventually, fencing replaced karate, but neither one ever trumped cycling. I got into hot rods in high school because my folks wouldn't allow me to by a motorcycle, and by the time I was ready to explore that again, I was married with a son.
I eventually got back into formal training in taekwondo 2005 and got into hapkido in 2008 (I think). I got my black belts. I also eventually did explore motorcycles again in 2011, got my license in 2012, and bought my first Harley Davidson (96 Superglide) this year. And I have been teaching kendo and participating in fencing on some level consistently for a while now. I still keep my HKD and TKD chops in practice, but it isn't my main focus.
None of that is a reflection on where I trained; it is simply the direction that my life has gone.
I have a student who is fairly good in kendo, but he's also a hot shot tennis player. Guess what he's practicing outside of class.