I'm apparently not exposed to the problem, but then, the only young people I talk to are online.
(I will say it's somewhat strange to hear this issue raised by someone with significant difficulties with grammar and word choice.)
I'd have to understand why people think it's a problem, or more specifically, in what way is it problematic and what is it leading to? I'm inclined to say it's more important what you do with what you have rather than how little you have, but perhaps that's just a pukey plattitude. When I would go to French, German, or Chinese round tables to practice my language skills, I was certainly dealing from an extremely limited vocabulary, but I never felt that detracted significantly from the fun or my ability to communicate, though perhaps I'm comparing apples to oranges.
I guess I just don't understand what you think the problem is.