Generally an "undisputed champion" title would require a level of effort that the AlphaZero team apparently isn't interested in. They like to run matches between AlphaZero and Stockfish in private under their own controlled conditions, and publish the results. The rest of the computer chess world likes to run tournaments in full public view, and there are several entities which run tournaments between engines that way which can be used to gauge the relative strength of the engines.What will be interesting is to see the effect on Leela (https://github.com/LeelaChessZero/lczero), which is public and open-source, takes part in public tournaments, and is built -- as much as possible, based on what's been disclosed in the papers -- to use the same approach as AlphaZero.
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