How would the world look like now if the Imperium Romanum never ceased to exist?

In the Antichrist Nietzsche writes the following:

[i]"The imperium Romanum that we know, and that the history of the Roman provinces teaches us to know better and better,—this most admirable of all works of art in the grand manner was merely the beginning, and the structure to follow was not to prove its worth for thousands of years."

"The whole labour of the ancient world gone for naught: I have no word to describe the feelings that such an enormity arouses in me.—And, considering the fact that its labour was merely preparatory, that with adamantine self-consciousness it laid only the foundations for a work to go on for thousands of years, the whole meaning of antiquity disappears!… To what end the Greeks? to what end the Romans?—All the prerequisites to a learned culture, all the methods of science, were already there; man had already perfected the great and incomparable art of reading profitably—that first necessity to the tradition of culture, the unity of the sciences; the natural sciences, in alliance with mathematics and mechanics, were on the right road,—the sense of fact, the last and more valuable of all the senses, had its schools, and its traditions were already centuries old! Is all this properly understood? Every essential to the beginning of the work was ready;—and the most essential, it cannot be said too often, are methods, and also the most difficult to develop, and the longest opposed by habit and laziness."[/i]