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Your observation has pleased the great and mighty Spengler.
More seriously, though: it is indeed extremely unlikely that any Empire could stay together for the period of time that would be needed for Rome to get to cover that size. The best scenario I can imagine is one where Rome does do better, but ultimately still falls apart, and later gets re-united tue to the stronger legacy of its first 'incarnation'. If we combine greater scientific/technological progress with the greater general development of the "First Roman Empire", then it becomes vaguely possible to imagine a later "Second Roman Empire" that becomes technologically advanced enough to conquer its way into Northern Europe (which would also be more economically sensible, due to more advanced agricultural tech making the North more exploitable).
In such a scenario, however, almost nothing can be said for certain about the linguistic situation.