Also, as said; they could totally introduce you to the Scions in a similar fashion in Ishgard. Thancred already shows up in multiple places anyways, and given what we know about him, a brief excursion into Ishgard makes a whole lot of sense, anyways.

Regardless, whatever the Devs decided, it's obviously far too late to be suggesting anything that big one way or the other. It'd just be nice to get an official statement, so that we can sort of plan whether we want to wait for Heavensward, or level up new characters now, rather than later.