Is it a real issue if the emperor is of Germanic origin? I believe that what really matters is that he's the "emperor", and not just the king of a German tribe. The real strength of the Romans was there capacity to assimilate peoples of different origin and tradition, and bring them within the fold of the empire, so that in the end they became Romanised.Norman said:I really think that the problem you're going to have is that by the time the Western Empire fell, the Western legions were comprised of germanic soldiers led by germanic officers.
We can stop the Goths by letting them conquer Greece and Anatolia, we can then have the Vandals and other East Germanic tribes 'follow the money' and join thier linguistic brothers in Greece. We can even keep Italy from falling, along with the Iberian Peninsula, but the Emperor of this area is still (eventually) going to be drawn from the Germanic elements of the army.
The Eastern Empire can't help (it has to contend with the persians, Goths and Arabs, and the celtic peoples of France are by this time thoroughly Romanized. (BTW this was also true in England, modern archeology is now suggesting that the entire island was part of the 'Greater Roman Economic Sphere', which was why they fell so far.)
Another thought: in a situation like this, where the western empire retrenches in defensible areas, I believe that most of Gaul maybe lost (they will try to hold Provence, to ensure a land connection between Italy and Spain, and maybe Brittany and Normandy). The empire could also try to keep a foothold in Britain: not the Thames plain, since it is harder to defend, but possibly Wales. The outcome could be a stronger Celtic flavoring in the mix