Was the breakdown of the global multi-polar distribution of power during WWI through WWII (1914-1945) highly probable?

Yes.

I would concur that the breakdown of the multi-polar distribution of power between 1914-1945 was more or less unavoidable and unpreventable. To conclude what was going on, we need to look back to the 19th century. Most of the 19th-century events, from the end of the Napoleonic Wars in 1815, Great Britain was considered as the world's incontrovertible superpower. Britain had the largest, most powerful and strong navy in the world. It was the incontrovertible and undisputed ruler of the seas.