I've seen decline on my end, not to mention a huge influx of new people posting videos and starting their own sites. Five years ago when I started, there were no more than 3 or 4 sites putting up quality material. Today, that number has easily tripled!
So to answer your question, I don't think the demand has decreased, its just that the supply has dramatically increased. But don't let that discourage you. You will find people that will gravitate towards your style, who have tried all of the others, and have found them to be too complicated, or too slow, or talk too much, etc.
So go and do it!!! Do it the way you know how! When its all said and done, thats really the only way to know if there's a need.