Looking back, Uganda seems to be poised to lose the war.
The Simba Batallion mutiny is the main cause of Ugandan incursion of Tanzania, which led to war. If Simba didn't mutinied, there would be no war. At least, not in 1978
Moreover, Uganda is on really tight economic budget. United States, their biggest coffe importer (and Uganda's source of 40% of their oil), has just boycotted them. Coincidentally, the coffe price also slumped. Politically, in 1978 Amin had just survived a coup by his Vice-President's (Mustafa Adrisi) supporter. This coup fractured the military badly, as like Amin, Adrisi power base lies in military
Through it is also to be noted that Tanzania's army was concentrated in their southern border with Mozanbique with the whole civil war going down there. I suppose if the Ugandan can pull a blitz they can take Bukoba quick enough. But as I said, Uganda is in ruins and in no position to pull a miracle
So I suppose the moment Ugandan army crossed the border in 1978, they're ducked.