Just to clarify: in events where one player pays all antes, far more often than not you're going to see the BB putting out the entire table ante, not the button. Button ante has problems such as dead button, etc. The BB is the only "must play" seat, and does not have the BB twice. ARIA using it fairly extensively, definitely a coming trend.
By the 2019 TDA Summit there will be alot more global experience with it and will likely be subject of discussion, possibly for a TDA Recommended Procedure for houses that choose to use it.