Related to my Caesarion thread from yesterday...
WI Julius Caesar achieves his stated goals, and dies after arranging an orderly transfer of power. The specifics don't matter, either something along the lines of the pseudo-monarchy of Octavian, or a revitalized Republic. The important part is that, for the foreseeable future, Rome is spared any major civil war.
What impact does that have on their society? There's going to be many more legionaries and auxiliaries alive and kicking (knock-on effect that they'll need land). There's going to be many more Senators and Equites alive, as well (knock-on effect that their land won't be available to give out). The coffers of the state will not have been drained as much (except in infrastructure projects). Egypt, on the other hand, likely remains a client state for a while longer, depriving Rome of the chance to extract as much wealth.
This whole scenario also implies a victory over Dacia and Parthia. We'll assume outright conquest in the former and favorable terms in the later (return of the Eagles, pro-Roman client kings in the border states). The impact of that on Roman society? Lots of gold coming in from Dacia, after all.