WI: Greek West and Greek East in Roman Empire?

What if at the time of the expansion of the Roman Republic, the Greeks had managed to Hellenize both the west (through Massilia and perhaps an Alexander conquest of Carthage) and the east (through diadochi states as historically)?

In a Greek dominated Mediterranean, where would Latin expand? Would Roman Italy eventually become Greek through immigration from the rest of the empire? Or would Hellenism be spread so thin that some areas that became Greek would become Latin?

Perhaps Latin could spread to the Po Valley, then the general area of "Austria Hungary", and then along the Rhine or Danube.
 
Well, we need a Rome that speaks Greek as much as Latin, even amongst the Common Folk. Best way to do that is a successful invasion of Italia IMO, even if the Greek rule isn't that long.

Hypothetically, lets have Alexander live - conquers Carthage, and then moves on to Italia for his penultimate campaign before taking over Iberia, after victory in Italia, he appoints a general as Governor, based in Rome (being roughly central in Italia) - orders the creation of a road system through Etruria into the Po Valley, and more Greek colonisation.

Greek rapidly spreads throughout this area via the Greek colonies, which includes Rome, or perhaps focused on Ostia. So Greek Ostia, Latin Rome - Greek gets primacy in the world at large, so many traders, politicians, and the common folk begin to learn Koine greek in some way (or another type of Greek).

When that empire disintegrates, the general, or the people of Rome take over - who speak Greek, the outlying regions speak Greek and it becomes the most useful language, becomes the language of administration, and Latin is largely forgotten except as a regional dialect, or later as the variant input on a "Hellenic Language" if the Empire falls apart.

TL;DR - if there is a only very brief Greek rule, rather than Dynatoi-length rule, then it may stay Latin. Otherwise, I think Latin will be unimportant, but the Empire will be able to communicate with its local rivals much more easily.
 
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