From what I've been told, the fantasy market -- and especially the market for "traditional" quest fantasy -- is not crashing, but is not as hot as it might have been several years ago. (Side question: is thirty years long enough to use the word "traditional"? Somehow I don't think so...)
Two major factors seem to be coming into play here. First, pricing pressures are discouraging the publication of Big Fat Books (where Big Fat = bigger than 120,000 words), and quest fantasies tend to run long. Second, there are a lot of established authors mid-series right now, and there are only so many quest fantasy series a single publishing house can release.
The demand for "blockbuster" books -- of whatever subgenre -- is still, and is always, high. There's also still demand for odd, quirky, original stuff (I suspect because that's what editors like to read). But there aren't nearly as many spaces left for a traditional fantasy manuscript to fill these days as there used to be.