Most of the cynicism I've seen from musicians has to do with constantly playing music that is not dear to them; just doing the gig. That turns music from a calling into a job, like Paul was just saying. Might as well just go get a job if that's the case. Better hours and benefits maybe!
For me, the times when I'm not close to the music, not creating and expressing myself through music, are when I start having the thoughts of "what's the use?". And life feels pretty grey, when I think my dreams are slipping away... But then I play with Jim and Randy, maybe have a good rehearsal or a good gig where everyone enjoyed themselves and walked away smiling, that I remember what my purpose in music is. And what music does for my sense of well-being.
In anyone's life's work, there are bound to be ups and downs. 2004 was a very rough year for me, so much so that a part of me is afraid to be hopeful and excited about all the great things that are coming together both in my personal life and with the band. Like, when is the other shoe going to drop? And I know that even if all these things pan out the way we are hoping, there will still be challenges ahead; I'm old enough to realize that. I think the most important thing to do in the face of it all is find a sense of equalibrium, that calm center from which you can have perspective and peace, no matter what is going on in your outer life. The Middle Way, never too high or too low. That's what the philosophers say anyway, and I'm sure they too had their moments of despair.
Music absolutely does spark life, when it's done with that intention. I think it's imperative to keep the focus on that, and not let the bullshit get us down. And if you do get down, just come here and vent! I'm sure someone will be around to listen and offer encouragement.