It will be back to the status quo, obviously. Kenya has always been depending on these few countries in the region to grow economically (in fact, there was a period it was relying on none of them at all!), and also by exporting its goods and services abroad. It thrived in the 70s, even when the region was mired in conflicts and mistrust. What will be different about another war in Ethiopia and Sudan?
Kenya, lately has been trying to make some trade overtures in these other parts of the region; Ethiopia, DRC, in the newly formed country of sSudan- these rather volatile places- owing to the apparent expnsion of the economies in these places.
Who will invest in the LAPSSET? It will then have to be the Kenyans themselves, for this piece of infrastructural project was intended to carter for them after all. We will be constrained to alter our failed initial strategies, to conform with the prevailing situation. Sitting back and doing nothing about the failure is not the plan on the table. To us, no adversity is insurmountable. We are dynamic like that.
But u shouldn't be very certain that the war in the sSudan will last for ever, or that a war is really inevitable in Ethiopia. You shouldn't be very certain that your project with Uganda will sail through seamlessly. These ventures are wrought with risks, it is unwise to be so certain about success.
The LAPSSET, will eventually prove a worthy investment in the end despite what the critics and doomsayers like you say.