[panzerfan]

Well, I suppose it depends on perspective. It is true that Haruhi really doesn't seem to always get what she would like, perhaps due to internal doubts and whatnot, form an observer's perspective, a ridiculous amount of power has already been concentrated in Haruhi's hands, and anything that she really wish it to be is to, at least based on how observer would see this within the Haruhi settings.

Planning for a scenario where the world ends is rather foolhardy, so the obvious assumption would be that Haruhi would've left permenant marks on the universe that people after have have to contend with, one way or the other.

The question then becomes... would it then be advisible to have the successor rule by dictat and consolidate that kind of ability, while being even more inept than Haruhi, or that it should be up to every stakeholder within the universe to cope with that scene, as they struggle and bicker amongst themselves based sorely of their unique interests?

If Haruhi would just rise as Jesus did, then the situation would be fine, since Haruhi is still Haruhi and thus 'predictable' in this sense. Unfortunately though, either some will wait for Haruhi's natural demise or the radical in the Curia will do away Haruhi as Brutus did Caesar, if they see Haruhi having such consolidated power as too dangerous for the general good of the universe.

(Now, the prospect of Octavian coming in and clean house and becoming another Caesar authoritively wise would be a whole other ballgame)