It goes back to No One Ever Got Fired For Buying IBM. ;-)

When I came out of comp sci school in 1978, everyone thought that DEC and Data General had an insurmountable lead and that PCs were toys. Then they thought Macs were toys. Then they thought the web was a toy. I've been to countless tech conferences where the top guy from some "dominant" company told the tale of how dominant they were and two years later they were slinking around in the back of the room, no one wanting to talk to them. I could name names, but just read my blog. Hubris is a terrible thing and tech is filled with it. And your post was totally a product of hubris ;-)