Actually, HTML5 may be young but it's growing exponentially. A few people I know are making a living off HTML5 games because they jumped in with it very early.
I finished my entry for Ludum Dare yesterday, I entered the 72 hour jam as I slacked too much and didn't finish in time for the 48 hour run.
My first released game in Java and I even ported it to an applet after an hour of battling the signing process...
http://harrk.com/applets/LD25/
