All the jobs in FFXI wasn't added as quickly as 'that'. It did take expansions to explain the lore and origins of each job. Not that FFXIV can't do that but it's taking this long for SE to even add more content while just fiddling with UI and other glitches in the game.

I'm all for Sam, Nin and even Thf jobs. Probably Thf should've been one of the basic job out there with Pld and Drg, WTH???

We need 'hate' control, a elemental-wheel wielder and maybe a master of skill-chains!

A bushido class would be apart from a marauder class(it's based on eastern martial arts) but it's still a two-hand weapon wielder. Bushido should be introduced as a new class and you can become a samurai with it. Would a Marauder be proficient with a Great Katana or Katana. I think more of a lancer would spin off to become a samurai and it would use both GKs and lances.
Thief should be a spin off of Monks(since they have the pounce ability) duel-wielding and such. From Thf to ninja because of the martial art back ground.