They've finished the FFXIV story. There will be a little extra padding for the die hards, but now they are clearly shifting focus to make the game more suitable for the many millions of solo FF players who skipped XI and XIV.

They could well lose 50% of MMO players, yes, but they will gain 10 times that number in solo-players who can then experience the story from ARR to EW.

There was one tiny hint to the wind down of the game in the last Japanese live letter, #70... Yoshi said "I hope we can still make it to live letter #100". Which goes against the "10 years more" and brings it to a much shorter period. Enough time to push the solo players through.