Not sure about the 8 reasons why BTC will fail, but the question to the OP, can also think of reasons why it will not fail as well?
Bitcoin has been with us for the last 10 years, and if there are chances that it will not succeed, then it should be in it's early years. And it almost happen, many early adopters quit and few of them really stay. But still even if the disappearance of Satoshi, the market continue to thrive to where it is right now.
So to say that there are reasons now for Bitcoin to fail? it could be just pure hatred on it, in my opinion. Then we think and insert terms, and what not to confuse Bitcoin enthusiast and then preach all about the so called fiat system.
Bitcoin never fall,the price of bitcoin will make some pump and dump based on the market demand.Many people say the Bitcoin will end this year,but the bitcoin was step forward in the market and make the people rich.Who try to hold for the longer duration with the ups and down in the market.The bitcoin is the only coin is fit to buy at any price,because we know it’s possible to get the profit in the next bull run of the market.By considering this strategy,many bitcoin traders holding their own coin in the bitcoin for longer period.
Actually the 8 reasons you talk about are quite reasonable. But I think these 8 reasons are too much. Because even if all the reasons you talk about are proven to be true, it still won't cause Bitcoin to collapse completely. Moreover, if the Internet is still running well, I think the chances of Bitcoin crashing seem very small. Although manipulation and monopoly in bitcoin do exist.
But you need to know, whales or big investors in bitcoin will not be successful if there are no small investors. Because bitcoin is an investment asset. And it won't work well if only one group plays a role.
The bitcoin had their demand in the current market,So how it collapse completely.This is not possible and unacceptable one.Because the product which had the demand will not exist the market as like you think.The bitcoin is the decentralised cryptocurrency,so the monopoly of the bitcoin was still their.Even the new traders get into the trading will look for the bitcoin as their first wish.