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 bitcoin fails the moment a monopoly forms in mining; we call it a 51% attack 
 How long of a 51% attack would need to be sustained ? 
 bitcoin as a protocol is transparent enough to let anyone openly audit the system 
 Why and
What are the chances? 
 I disagree. The incentives drive miners to have a modicum of integrity.

Besides, we’ve seen 51% accumulation on mining before and bitcoin has survived them all. 
 We re already there 
 Only if the attack is actually executed. 
 Although I dont follow Antonopoulus since he mastered Ethereum maybe this helps
https://youtu.be/JDZVW4hri2g?feature=shared