Both FLG and Nova have stated their tournaments will use the minimum (reduced) size. Where they lead, tournaments follow. They're gonna sell a crapload to tournaments and tournament players who want to play on the 'official' sized mat. Not saying they're evil geniuses that planned this from the beginning, just that it's... convenient for a part of their business that had previously crested the top of the sales curve.
I don't have a dog in this fight. I don't do tournaments, only playing in my basement on my 4x6 which ain't gonna change (unless there's a OFCC in '21 -- never been to one and it's right here in my back yard). I can, however, spot... conveniences.