The Strongest Political area in Occitania in history will be either Guyenne/Aquitaine and Arelat not Toulouse.It will no doubt end up incorporating features from other Occitan varieties as well, but I think that the standard would be largely based on the speech of the capital/dominant region.
Side note: Parisian French is terrible, even Parisians will admit it isn't pretty.
Best dialect of French is arguably the one spoken around Tours; clean and melodic.
Or rather have French retreat in the Black plague.You need a crown of the land to use and impose the language as official. Therefore, France must be weak enough not to be able to swallow the whole Occitan nation.
Or rather have French retreat in the Black plague.