This game isn't about action and there is such thing as dodging in this game - just raise your DEX. It increases crit and dodge rate.

Your idea is a good one, but it's best suited for a different kind of game. Final Fantasy XIV is an ORPG, so dodging attacks is based on a stat-based mathematical formula. It would be cool, though, but it's very unlikely that Squeenix will add it, and if they do, there are a lot more important things to add first.