Lemur866, I think our positions are pretty close, I’m just less sure than you, when it comes to the inevitability of the “end to republican rule”. Sure, it had to end sooner or later, just like Rome couldn’t possibly avoid its eventual decline, no power ever stays on top, but I don’t think the republic was inevitably done already.
Yes, neither Marcus Antonius, alright: Marc Anthony (do you know why Roman names are anglicized?) nor Pompey had the abilities to restore long-lasting order to the Roman civilization.
But if Pompey had won, Marc Anthony wouldn’t have been an alternate candidate for leadership anyway, because he would have followed Caesar either into exile or death.
There was, however, at least one alternative to Pompey: Cicero. His two major blunders have damaged his image as a political leader in posterity; but in our scenario, the first one wouldn’t have been considered a blunder, because this time, he chose the winning side – and his second blunder during his campaign against Marc Anthony wouldn’t have happened at all.
And if he had campaigned against Pompey, his chances for success would have been higher, because he wouldn’t have had lost prestige (being one of the losers of the civil war) and he would have had an adversary who had proven time and again that politics wasn’t his strong point.
I think, Cicero could have emerged as the political leader after Caesar’s defeat and his career as well as his work tell us that he would have known what to do to strengthen the republic.
I don’t know how persistent his order would have been, it surely wouldn’t have reached the stability of Augustus’ rule, but he might have revitalized the republic enough to add decades to its life.
Finally, another attempt to achieve autarchy would have been successful – but the result would have been a different Rome than the one of the Julio-Claudian dynasty.
Unlike you, I don’t think that a couple more decades of republican rule would have doomed the Roman sphere of influence. Time and again, the leading families had shown that they would close ranks as soon as Rome itself was in danger.
I don’t see any basis for the assumption that they had already lost the will and skills to defend their place at the top of the Mediterranean world against an outer enemy.
Besides, who could that have been? Too late for the Gauls, too early for the Germans, the Parthians too far away …