Not just that it is envitable for all empires to come to and end because of ever other other country or place wanting there freedom back or wanting power for themselves. It is impossible for an empire at that time to survive because they dont have powerful enough weapons or pure power to able to keep people in there grip.Also in my opinion the romans expanded too far even though this is human nature to want more and more power. It is nearly impossible to control the world and thats what the romans basically did well the known world to them and this just made there fall too come quicker than proberly it would have.

The barbrians also began to use more horses and the roman infrantry was made to change and it never really worked again in my opinion. The barbrians also began to hit back at the romans more and more and with more power than before.
So with the comment that if the rome had never fallen it would never had happend .I know its a thought that could go through your mind but it cant happen and never will happen with an empire