I would have to agree with DVS. I still install a few hollandstone projects each year. As common as say brussels? No, but still around. They are cheap, so if someone wants a cheap patio thats what they get. You are correct in that the market is changing. Larger dimensional and linear stones appear to be the newest trend to hit the market. If you look at a lot of the new catalogs out lots of new larger dimensional lines out there. The whole marketing pitch with these barn planks is you never need to stain them or have the splintering wood etc. Which is nice, but as you said still some kinks to work out. I am sure they will be here to stay at least for the next few years, but I don't think there are going to be too many large patios installed from them.