It is widely known that at the time of Caesar's conquest of Gaul, the region was highly developed and well on its way to develop into its own civilisation. Suppose two centuries earlier Carthage consolidates its Sicilian holdings before the Romans can intervene, thus butterflying away the Punic Wars and the rise of Rome, giving enough time for Gallic civilization to emerge. What is it going to be like? We can really only guess but I suppose there may be a few imaginative people on here who could share a thought or two regarding the issue, being well versed with the place and time, etc.