I think people are confusing free to play and a limited time trial.

XI had a free downloadable client with a 7-14 day trial with restrictions.
XIV already offers the first month of play for free. Just need to buy your copy.
Doesn't seem too ridiculous for them to offer a trial period as a free download from PSN.
(Eventually off of their website for PC.)

Strongly against all ideas that are along the lines of free-to-play, though.