Kenya is a lost cause. The Sahel--if not suppressed by ECOWAS and Nigeria, may become true socialist states.
But like you said
... the US will try to intervene in the Sahel ...
The US has been increasing their military presence in W.Africa, and their most used tools (terrorists) are getting louder and braver as the days pass.
The French are at the helm. They, the US, and the Nigerian government are working together.