Ok, lets say that Varus doesn't get his ass handed to him by Armenius. Lets say that Germania Magna is pacified as well as any other western province and the Rhine frontier is replaced by the Elbe frontier. Assume that no major expansion into Germania occurs any time within the next century or three. Other bordering territories (Britannia, Dacia, Armenia, etc.) might or might not be conquered.
Now, out of 100 parellel worlds where this happens, what percentage have some form of the Roman Empire surviving to the present? A byzantine type Empire would qualify, but the Holy Roman Empire wouldn't, nor would any foreign power conquering the Empire and claiming to be Roman (such as the Ottomans).
Now, out of 100 parellel worlds where this happens, what percentage have some form of the Roman Empire surviving to the present? A byzantine type Empire would qualify, but the Holy Roman Empire wouldn't, nor would any foreign power conquering the Empire and claiming to be Roman (such as the Ottomans).