Again, worthwhile - to whom? And again, you can apply the very same logic to (some) adults. Many people, actually, do this. That's why they ban drugs, for example. That's why they setup(or allow the setup of) censorship systems(china great firewall and many others). Some people are just too dumb to think.
This may sound irrelevant to the discussion, but it is not. What age is not early age? Parents always be more "grown"(their age number will always be bigger).
Coercion is killer of motivation: force kid to play violin, and he is likely to hate violin in the (near?) future.
I'm not saying that you shouldn't "expose" kids to music, math, programming and other great stuff, but I'm saying that you probably shouldn't force them.