Hi,
I'll add the quick Los Angeles perspective here.
It's impossible to make any sort of living in LA without being facile in numerous styles. My best students at CalArts over the past few years have been equally at home playing symphonic literature, chamber music, new music, freely improvising, playing in Latin Bands (huge in LA as you can well imagine), playing over changes, and understanding a wide variety of styles (including world musics).
Some get called to play with the LAPhil, the occasional studio date, record their own music, tour with the Industrial Jazz Group, etc. all within the same week. Take a look at
Daniel Rosenboom, Extreme Trumpet for the 21st Century: UPCOMING EVENTS for an idea of what I'm talking about.
How do they practice? By concentrating on their fundamentals and paying close attention to every detail when preparing.
Best,
EC