Not exactly. I believe back when HW was first announced Yoshi stated that he was getting tired of the whole 'Primals/Ascians/Echo/Zodiark/Hydaelyn/Empire' storyline started with FFXIV 1.0 and wanted to wind it up so he could "take the story in new directions". I lack a citation for that, but it definetely rings true with his more recent comments on the subject.

Either way, the setting and main characters will still be important even after the main story is 'completed' (FFXI showed that when it's storyline was wound up with the Rhapsodies of Vana'diel scenario), and it should go without saying that FFXIV's service will continue beyond with a whole new scenario, so really, don't worry!