Reviving this because we still haven't heard anything about it. It's a great way to promote class/job diversity in content.
Along with damage types, incapacitation can create room in content for classes/jobs that may be seen as "non-optimal". Also as we've seen even in 1.0 it actually allows some jobs to be viable that otherwise wouldn't be.
Take the Chimera and Monk for instance. Normally you wouldn't put melee anywhere behind the Chimera because of the poison tail. However through incapacitation Monks can remove the tail and are now much more viable in this fight. Were that not the case I fear most would deem the situation too dangerous for Monks.
Through effecting the move sets and drop rates of enemies, incapacitation is really a great system and I definitely hope we see more of it in 2.0.