Dont like that idea.
Its to many times to press the jump buttom. Its hard for me to Image it, but, it looks for me similary to the Samurai (allways press the same start skill and than use two other for a new combo). And i dont like the Samurai much, because his attacks feels so disconntected. Dragoon is very streamlined and feels strong connected. And i dont like the idea of building up your speed first. Whe had that with the original monk. And he was at the start allways so slow and had lower dmg, because of it. A 2 phases fighting stil, like Red mage, Black mage or reaper is questionable. It can feels to disconected (Red mage with his distance phase and than meele phase). Or has to much focus on one phase (reaper, where the fun part is mostly with the void skills, but it can hurt your finger, when you need to press allways the shift Button for the second line of skills). Or, feels so unimportant, that it could practicly vanish (ice by the blm is so short, that it has nearly no meaning).

The idea from Shurri looks for me similary to the monk (the second, most streamlined class). But even that looks for me, as if you has to press the same one skill to many times (good saying from a blm, who "only" use fire4^^).

Even the idea of the using of the mp is questionable. No Non-caster DD use mp. And it wasnt a good idea for the bard.
I think, whe shouldnt think to much about, to change the core set of the class. A little change and new direction, like with the monk and his chakra System, is ok (the monk changed from a class with gauge to one without and has know a other gauge).
But, it didnt need to change as much, as it was with the summoner.