From my experience with linux and audio I would say it
is too early to
start widely promoting linux as a professional audio solution, in
general.
It is just not there at this point.
A couple of things could be "promoted", though.
Companies or individuals that want to offer commercial (professional)
linux audio solutions or services can promote their product(s). I think it
is _not_ impossible to assemble a turnkey solution that will work for a
given task. If it works and you want to sell it, then of course you have
to promote it somehow. But it is the company promoting a product, not the
linux audio community as a whole promoting the platform.
Another one would be sharing success stories. If you are using linux in a
professional audio environment successfully then by all means tell the
world (and us :-). But tell the whole story, including the painful start
(_if_ it was painful, of course :-) as well. I'm not talking here about
the more common "I finally got ardour to work and it is cool" but the "I
cut an album with ardour, it was not easy but the end result is great"
(just an example).
IMHO word of mouth from users that are happy with their systems is what
should make linux successfull in the professional audio world.
When that happens big commercial companies will probably also take notice.
-- Fernando