I think the reason for the fire might be just speculation rather than facts.The fires wuld have a very negative effect on Tanzanians than Kenyans since they will harm their own wildlife.
The way I see it unless the Tanzanians intends to degrade Serengeti to such a level that it does not attract the attention it gets so that they can continue with the 'Super highway project' Burning their side of the migratory route will not stop the migration....it might even encourage the migration even more as animals flee towards Kenya.
'......to the acknowledgment of the mystery of God, and of the Father, and of Christ; 3 In whom are hid all the treasures of wisdom and knowledge.' Colossians 2:2-3