The logistics of relocations are going to be extremely difficult.
Before the earthquake, the local infrastructure was not that good. Fresh water, food, housing, power and utilities were already maxed out. Haiti is the poorest country in the world. Relocate millions of folks to where?? The terrain and environment can only support so many. As mentioned, most of the land has been stripped of trees, (do a google satelite map search of Haiti) it is quite obvious.