It does not solve any of the underlying problems the kids are facing. .. we don't do anything about the kids not having any futures because they can't afford to go to college
That's an orthogonal issue. Suppose they did have a possible future: they'd still have the problem of classrooms being unviable because the kids are on their black mirrors instead of paying attention to class.
If you want to fix the economy or education funding or whatever, fine. Go for it! But while you're in the middle of that Herculean task, you're going to have teachers pleading "do something about my immediate problem right here and now. Mr Legislator, this will take just a few minutes of your time away from your bigger grand economic project that you're spending years trying to formulate."
Whatever good future you envision, is going to be more possible/probable if classrooms are able to function. And it's not like they're selling this ban-phones-in-class thing as being the solution to college funding, are they?
This is something dipshit neoliberal types do so they can Pat themselves on the back doing good without actually doing the hard work of doing real good.
Let them! If even a few kids start paying attention in class, the dipshit neolibs will have earned a back pat. Dude, it's just one back pat! That's all they're getting, not a contract for five years of daily blowjobs. They'll still have to earn that by solving your college funding problem. And in exchange for this one backpat, they'll address the experts' (i.e. teachers') concerns about how classrooms are getting fucked up by black mirrors.