Well, I'd love more time for my hobbies too, however it's not realistic to think more time spent doing pleasureful activities will yield more productivity in general. The world is filled with musicians and artists, but very few of them actually produce anything beneficial to society.
Art and music are important components of society, but the influential pieces come from a very small minority, and that's unlikely to change. The successful people are more closely paralleled with an entrepreneur than a typical street artist... they posses the drive and motivation to do what it takes to become great. This involves schooling/training, often more than 40 hour work-weeks, managing people and the business around your work, etc. Everyone else is a hobbyist, producing things for self-consumption in large-part, which does not contribute towards society in a meaningful way.
The people we're discussing here are the types that loathe and bemoan a 20 hour workweek, let alone a 60+ hour workweek the Jay-Z's of the world find routine.
> Jobs pay because no one would do them if they didn't pay.
I disagree. There are many types of occupations which do not pay (volunteer work comes to mind). Further, if there was no means to generate income, there wouldn't be a way to purchase goods, which in turn keeps others employed, etc. In a society where things are all totally provided for free, society will stop innovating (there's no reason to push the boundaries anymore).