Maybe in the short term, audio shows will be gone...is that a year? two years? Right now it is hard to say...but is a slick, high production value video done by some "audio market specialist" worth the money. I'm not so sure.
Keeping your name out there, remaining visible and relevant are important. The magazines reviews help to do it...the forum mentions and reviews do it...local in store demo events do it....interviews do it...and so on. They are all important.
I suspect though that more and more visibility is happening through Youtube...look at the channels for PS Audio or for GR Research as examples. Good topics, good presentation. The only thing missing is turning views into orders...in my mind, every view should end with a link to a "discount code" or a chance to try a product at no cost.