As a Total war gamer you should be ashamed of yourself!
While the Germanic tribes hammered the last nail into WRE's coffin, Rome had been in decline for over a century and had almost torn itself apart several times - they were doomed mostly due to their own politics and if the Germanic Tribes had not raided Rome someone else would have.
I would also argue while the SPQR had a big effect on our culture, Christianity had a much bigger effect and it is a shared religion that ties us culturally together with the Germans and the rest of "Europe".
Eh, while I agree with the gist of your sentiment, the Theory of evolution is a biological process and has no place describing political situations - Romes fall had nothing to do with evolution - instead it was a series of political mistakes.
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