An interesting idea, yes, but typical of a romantic interpretation of events. First 'Goshen' is a Hebrew word with no Egyptian equivalent, so we don't know where exactly the editors of the Pentateuch thought it was. Secondly, Mernpta did not anihilate his enemies. Oh, I know he says this on his Karnak inscription - trouble is, though, every Egyptian king said the same thing - there's even a depiction of Tutankhamun smiting 'Asiatics' and slaughtering them - despite the fact that this dates from his year 2, when he was about ten years old. Merenptah's father, Ramesses II,claimed the Battle of Kadesh as a massive triumph for the Egyptians - when at best it was an ignominious draw. The evidence is that the Lybians settled in the Western Delta. They later assimilated Egyptian customs, and, indeed, rose to rule the country in the Third Intermediate and part of the Late periods. The Canaanites, far from being anihilated, continued their campaigns on both land and sea as the 'Palistinu' - sea peoples' who were successful in establishing Phonecia as a state, but repelled from Egypt by Ramesses III - and settled with his blessing on the coast of Canaan - to become the Philistines (and later Palestinians). Don't take the propaganda on the walls of Egyptian Temples as historical fact without examining the other available evidence. Merenptah may have seen himself as a warrior king - but at most he was trying to consolidate the ground his father claimed.
