Funny, I do not see a drop in sales for SUV's and trucks in my area nor do I see a waning interest in high performance cars, some people just don't think green.
According to data from NMMA sailboats are only a fraction or small percentage of boat sales. Most boat sales are those that have outboards on them, likely trailerable, after that the inboard/outboard and on up the scale. I did see a big surge in the kyack/canoe sector relative to the original small market share they occupied. See links below:
I realize this data is a few years old but it does indicate a trend. Powerboats are still the boat of choice despite the fuel costs.