I doubt it. Casamance is the most fertile part of the region, but unless Haitian are used to working the land, it will not work so well for them. There is plenty of land in Senegal. There are only 2 problems: 1) If you want to live near the beach, then you have to move 30-45 minutes outside the capital, 2) There is not much infrastructure inland to accelerate growth for a newly formed region.