Of course, it isn't true. History is never as simple as all that. In 1977, Yes were one of the most popular bands in the world, and punk was nowhere near as popular as disco. However, even though I think his premise is fairly badly flawed, I have found a rather interesting article about Yes, and why Rick Wakeman left the first time...
The order, Rick Wakeman remembers, was for chicken vindaloo, rice pilau, six papadums, bhindi bhaji, Bombay aloo, and a stuffed paratha. This was November 1973 and Yes had sold out the Manchester Free Trade Hall for a performance of Tales From Topographic Oceans. The album consisted of four songs that rolled gently together, over four sides of vinyl, for 83 minutes. “There were a couple of pieces where I hadn’t got much to do,” Wakeman would recall, “and it was all a bit dull.
During every show, a keyboard tech reclined underneath Wakeman’s Hammond organ, ready to fix broken hammers or ribbons and to “continually hand me my alcoholic beverages.” That night in Manchester, the tech asked the bored Wakeman what he wanted to eat after the show. Wakeman, the lone carnivore in Yes, ordered the curry. “Half the audience were in narcotic rapture on some far-off planet,” Wakeman wrote in his 2007 memoir, “and the other half were asleep, bored shitless.”
Check out Rick's Gonzo Artist Page
Check out the band's artist page at Gonzo