Is there not some limit to Walla Walla's wine growth?

Every time I visit Walla Walla, I find many more new wineries, many of them opened by Assistant Winemakers who learned their craft well and are making really good wines. But it makes one wonder: Is there not some limit to what the market will bear? Downtown in this tiny town there are enough wine bars for a city of half a million. And the prices! No longer the bargain it once was, but still among the very best wines on the planet.

I asked a gentleman pouring at Sinclair (See-have you heard of that one? Wines there are great) how many wineries went out of business, and he said it only happens when there is some personal crisis such as a failure of good health or a divorce. That suggests there is still room for growth. I think the economic boom in Seattle (and Portland) is allowing these wineries to print money like mad...

Photo is of K Vintners' downtown tasting room; a great space.