Rick
As stated everything is cyclical, but with Stickley furniture there is an entire history to learn to determine what the value of any single item can be.
The bookcase you looked at may be a Stickley 112 for instance, but who made it,where, and when, can have a dramatic effect on it's price. A lot of Stickley furniture was made through the years. There is no shortage of it.
That said, If you're looking at an original Stickley 112 for example, for $1K, that's a very good deal. The new reproduction model is $2500.00 and they're being sold.
The new generation is looking for the more efficient, sleek look, but how many of us painted cinder blocks and sandwiched boards between the blocks to build wall units when we were in our 20's, or had futon couches and beds, framed posters, etc.. Our taste, and buying power increased as we got older, and we bought more refined furnishings.Sometimes I think back to how our apartment was furnished when we were in out 20's and it's embarrassing.The "new generation" will be the same.
"The first thing you need to know, will likely be the last thing you learn." (Unknown)