The only problem I had with jumping back when they first hinted at it was the amount of work it entails. Actually adding in the ability to jump isn't the hard part -- the hard part is making sure the terrain supports it. There would need to be walls everywhere you didn't want players to go to (like off cliffs or mountain climbing in Mor Dhona), and many of those would either be silly-looking or have to be invisible. Eorzea was not designed with jumping in mind. The entire world would need a makeover! And that...

...is going to happen in 2.0. Since they're already re-doing all of the terrain, they can design it with jumping in mind and thus, I have no issue with it.