I have been looking forward to Red Mages eventually inclusion in this game. Even if it ends up horrible I will main it simply because I always thought it would ultimately be what my character becomes. Now I can see whether I have to hold up to the "even if horrible" part.

On the "level 30" vs "50" part...personally I only care in so much as the story questline is concerned, and our current track record is "2 seperate story lines at most per xpac." Old jobs get one storyline, new ones get 2. Course its barley a trend at this rate even and I'm not quite sure how Legacy worked with their class and job storylines, but going by ARR and HW "new" and actual new jobs get two storylines on introduction (counting classes for jobs in this case.) 50-70 gives enough space for two storylines even if they are connected to each other. Though if the storyline was fun I wouldn't mind starting at 30 for three seperate storylines instead.

Also remember unless someone uses a jump potion, newbies will still most likely need to beat Ultima Weapon to gain access to Red Mage and whatever other new jobs we get. So most of the "terrible" Red Mages you'll meet in the first new week are probably current/returning players. Aside from just figuring out how to do the job it probably won't be that bad.