Presumably level 50 is not the end of the road for level caps for this game. I think an easy solution is just in the future and perhaps even now is just to expand on the guildmark system. I have already bought every last ability from the guilds for pretty much all my jobs and already have a 50,000+ surplus for them. They just need to make spells and abilities added in the future based more on this system they already have in place. That will make it so you have to put effort to gain many of your important abilities and still allow noob players to be able to get their bearings for atleast the 1st 20-30 levels with an auto-learn system.