So, now Monk/Dragoon have to compete with yet another class?

[Ryans]

don't think they have the same main stats I am Alost 99% sure they will be dex stats.

I don't know how you could be 99% sure of anything. They just announced Ninja in a 1 minute long animation video. The dex stat has a tooltip of "Affects physical ranged damage, as well as parry and block rates." Not saying they couldn't change the way the stat works or they couldn't classify ninja as ranged damage (which just wouldn't make sense), but being 99% sure means you have some knowledge that no one else has.

In the short term, having them use dex would alleviate some stress on gear competition, I suppose. In reality you aren't going to bring more than 2 melee in most fights anyways so it's the same amount of competition. But in the long term, it would just make new classes convoluted. They would be giving a class a main stat based purely on whim rather than what the stats are designed for.

I also go by this.

Because I think Rogue will become Musketeer (that's why they didn't call them Thiefes?)

Musketeer is a class. They already have a guild established in Limsa so they won't be coming from Rogue. The question is what job branches off Musketeer.