...to become really talented, in everything form playing guitar to paint paintings. So, would you consider NOT playing Skyrim, and invest all that time into becoming incredibly skilled at something useful?
But those people who do become great artists and musicians don't spend their lives doing only that. Everyone has varied lives, be that a balance of working, maintaining various relationships, rearing children, reading books, exercising, watching films etc.
If you're asking if I would stop anything I find gives me entertainment or pleasure in order to better myself, then no. Because you need down time.
There's also the argument that all art is useless, so becoming a great artist or musician isn't really a brilliant way to spend your time as opposed to becoming a doctor or scientist. After all, if all you're doing is creating music or art, then your work is only stopping those who enjoy it from investing 1000 hours into something useful too.