At the moment the position of the cities is as follows:

Limsa Lominsa <-> Ferry <-> Some running <-> Ul'dah <-> A TRUCKTON of running <-> Gridania

The result is that Ul'dah receives a disproportionate amount of traffic, while Gridania is completely remote and almost deserted. This becomes quite serious when related to the Market wards, where everyone sells in Ul'dah, no one in Gridania, and only some in Limsa. Finally the traveling times to Gridania from Ul'Dah are already dispropiortionate. From Limsa they become really unacceptable.

Of course the ideal solution would be to implement airships between all cities, which would solve all travel problems.

In the case that such an option is not (just for now, I hope) feasible in less then biblical times, I would suggest to at least implement a river ferry that would go from Gridania to the sea and then to Limsa's ferry port.

That would mitigate quite a lot the problem and make Gridania more accessible at least from Limsa. At the moment the traveling time between the two cities are really excessive.