TTPS, what would you have these kids do? Kids these days spend inordinate amounts of screen time, that's basically useless, they used to hang out at the mall (I don't know if they still do...), their parents are dropping them into this or that to make up for the time they themselves have to spend at work, and they still have way too much time on their hands to get into trouble... My own kid, who's been a year round swimmer since he was 9, as well as being in the H.S. band, seems to always be on his phone or tablet ( he has the 6th highest GPA in his class, so i'm pretty sure his school work is getting done...).
Yes, the tennis kids spend a lot of time at it, but they have a lot of time to invest, or waste... If the parents are able and choose to spend money on their kid's tennis that's their choice, and it's not like they wouldn't have spent that and more on some other sport or activity for the kid. Little league whatever has turned into travel whatever, and what used to be rec level sports has turned into a billion dollar youth sports tourism industry.
In my own jr. career, born and raised in Miami, I did a few 10U tournaments and got more serious from 12U on. While I did have a lesson with Boleterri back in the day (he was still in Miami then) I didn't ever do the academy thing. Somewhere around the 16's I was doing multiple lesson per week as well as paid hitting sessions with college kids, in addition to peer practices and what not. Mind you, I was still in public school and still had time to race motocross, run a couple season of track in H.S., play Freshman football, and get into trouble with my friends.
My Dad and I butted heads, I chucked it, and spent the remainder of my Sr. year smoking pot, so much so that I almost didn't graduate. Because I'd had offers but decided to quit, my parents weren't willing to foot the bill for college, so i ended up in the Army just to get out of the house. I ended up getting my Bachelor's degree from a lessor university than i could have played for, and paid for it to boot...
So perhaps college tennis has some value if for no other reason than alternative paths might not be so positive...