An anecdote: My dad was driven nuts by how much time I wasted as a kid and teen on gaming, and how it seemed that I had few productive interests,never built anything, and stopped projects as soon as I got bored.. He wanted me to be obsessed with something, but few teens are obsessed with anything but not being lonely, social interactions more generally, and just following a random walk exploration. Dad never won those fights to make me serious then. But you know what? As an adult, I am quite different. I am now a post doctoral fellow conducting cutting edge neuroscience, having completed numberous complex, long-term research programmes that have required obsession, grit, and a determination to perfect his craft.
If your kids can avoid the usual pitfalls (e.g. a serious drug addiction) Im sure all your efforts will come into fruition when they are ready to committ themselves.
Today I buy my son Rasberry Pie's, laptops with GameMaker installed, etc hoping he too will find an obsessio. But he too resists i.e. stops as soon as he is bored.
C'est la vie