Was the downfall of tsarism and the coming to power of the Bolsheviks inevitable, or precipitated by other factors?
Also, do you know of any historians who argue that the events were inevitable? I've scanned the internet for specific historians, but can't find any :(
I don't think it was always inevitable but after sometime it became that way.
I asked a similar question about 9 months ago that /u/International_KB answered better than I can so I'd advise you to check that out.
They also cite works by Peter Waldron, David Saunders and Hans Rogger which you may find useful in your search for historians who hold this view.