Carthage isn't likely to beat Rome, and even if they do, all Rome loses is a couple of outlying territories. In long term, Carthage isn't likely to survive. However reverse colonization is certainly plausible and probably the best thing they can do considering.
As I said, not as drastically as Rome won (nearly impossible), but it would mean Rome would be unable to project power in the eastern Mediterranean. Which means Carthage might find a way to gain control over the Phoenecian cities and thus reverse colonise them and revive Phoenician culture there.
Carthage might as well have been the first example in OTL of a colony surpassing the motherland to such a dramatic degree. I think they could do something interesting if their interests targetted Phoenicia once they've gotten Rome out of the way (at least temporarily).
I disagree...the Minoans could survive as culture on their island, under certain favorable circumstances... way up to the raise of Christianity.
Agree... Sumeria is way too exposed so their population could survive, in a Sea of migratory tribes and population. They could not assimilate all of them.
If the Minoans can somehow survive up until Christianity, then they can survive that too.
But Sumeria? I've heard a theory that the homeland of the Sumerian language was the same region flooded by the Persian Gulf as sea levels rose. Meaning their culture was pretty much doomed to be supplanted by another culture before long.