Touring bikes, maybe, I don't know. European randonneurs have been using 700c tires for a very long time. Tubular tires, probably, until 700c clinchers got to be very good. I think the European tire companies never stopped making 650b tires, but most of them were heavy tires made for utility and commuting bikes. The 650b randonneur seems to be a fairly recent invention, and is not all that common, even in the U.S. I was looking at bikes at PBP in 2011, and probably saw less than 10 650b bikes out of the hundreds that I looked at. I definitely saw more Moultons than 650b.