So I thought of this a while back and posted it in another thread, but wanted to know what the community thought of it. The idea came to me as a response to other users' thoughts that BLM as a Job didn't feel like it added enough to the THM class. That the Abilities it grants don't fulfill the idea of specializing the THM to fill a DPS role, but instead add support to the Class. Ergo, I recommend the following:

I) Exchange the Abilities granted by BLM at levels 35, 40, and 45 for Blizzard III, Fire III, and Thunder III, respectively.

-- This would restrict the highest-tier damage spells to the BLM, as well as the increased DPS brought about by the Blizzard III --> Fire III transition and it's exchange of UI3/AF3.

-- Future THM-based Jobs would thus have to choose between Ultimate Destructive Power(tm) and their own Job Abilities. Again, Class = Diversity/Utility, Job = Specialization.