That's the idea. MAKE it unappealing for tome grinders (especially when you consider there are so many other options for them). If there are less people running it just for tomes, there'll be less cases of speed-runners/tome-grinders surging ahead of those who are new and negatively impacting the experience.

At the same time, so as not to seem totally focused on "preserving the experience for first-timers" there is still incentive with gil and GC seals. Perhaps other reward incentives besides tomes can be implemented. But largely, the idea is to make it less about speed-running for tomes and more for helping people complete the story and still get something out of it personally.