Nope. A Masters or PhD thesis with less than 50 pages is too little.
Sadly that is true. A Ph.D thesis should have a minimum of 200-300 pages. That said, I don't think that it will be that hard to add some of the finer details to the original BTC paper and "elongate" it a bit.
I've seen a 1 page PhD thesis before. It was just a single but mind-blowing equation.