The traditional RFP process is tedious and costly, in terms of time and communication. I was a contractor for years, and often found that after several days effort to craft a good RFP, only the last page (the price and timeframe) were relevant and discussed. For the last several years I have been on the other side, creating RFPs and evaluating responses from potential vendors. Writing RFPs well takes a ton of effort, and organizing the responses, which are all completely different, is a challenge.
I think this methodology could help. It's simpler for everyone involved, and can get the hard part out of the way sooner, so details and creative ideas can be discussed with a smaller group of vendors. I'll definitely give this process a try on my next RFP round.