That might be the best option is making it mandatory. The tools for teaching new users is already there and is very helpful but can be avoided if someone chooses to. Tooltips / Guildhests and all the things you've stated about guides / talking with people and have some general urge to learn will have people go far. Though, it's making them or trusting the users to do it that is hard.
I'm very interested in the job UI they talked about, and the additional skills to be shared between roles. It would depend on how they adjust the skills out there and how they can be combined to jobs to help them out. Personally I adore debuffing and party enhancing. So being able to customize it to an extent is exciting.
