Well, your response may be true in the sense that it has some merit. But, I still have to disagree both with you and Scerio. You stated the following "this political infighting was a direct result of there being no mechanism of succession such as existed during the republic. Moreover, civil war and unconstituional transfers of power long predate this period. There was no legitimacy to the rule of Caligula, Claudius, and Nero; the civil wars after that were also an effect of the fact that Octavian failed to develop a mechanism of accession; and the only way that subsequent emperors could keep a lid on the simmering civil wars was to engage in systematic poltical murders. Hence, "at Rome the slaughter was constant". Yes, there were a handful of good emperors who managed to secure the rule of an adopted successor. But if you count up all the emperors who served during the principate, nearly half died of unnatural causes or were deposed violently. That's not a sign of a healthy political system. So, no--Octavian's scheme was a disaster for Rome."
Your statement in your mind may be true back in the days of the republic. But that has nothing to do with Octavian's vision for Rome and it's empire. The mechinism of political change at the time allowed to be think and govern as a nation with many people and cultures instead of ruling itself as a city-state. Octavians political change allowed Rome to grow and establish itself as a super power both, politically, economically, and Militarily. Octavian brought to Rome stability for many decades. Now, Yes, I will admit that the mechinism of succession had it's flaws, but it was much better then the days of the so-called Republic.
You fail to recoginze the true reason and facts as to why Rome collapse. Again, succession played a part, but a very small part. over-time what really contributed to the eventual split of the Roman Empire was due to the following: poor leadership, civil wars, and the failure of political reform. First and foremost poor leadership in a way does play a part in the downfalls of civilizations, but it isn't a big reason. Here