Background ("PEP 572 and decision-making in Python"): https://lwn.net/Articles/757713/
Well, when he is dealing with arguments as silly as "but we will confuse = with ==) it's not a surprise he is tired and had enough. I just wish he had pushed through C style assignment before retiring. New syntax is ugly and introduces a new operator which basically does the same thing. When I've seen this PEP for the first time I thought he lost his touch after so many fantastic design decisions throughout the years…
But c-style assignment in Python was never going to happen, not should it have.