In Bitcoin there is no cost to miners for attempts at collusion. In fact it's not collusion resistant at all as there is no way to remove or punish miners. Miners in a way are the aliens that govern the protocol.
What would stop Wall Street from buying Monarch Mining Inc?
where there is money there is power... 5000 years of history proves this. Asserting otherwise seems to indicate a lack of monetary history. There is nothing new under the sun. Stephan Molyneux had an excellent video about this. The NSA had already a paper about cryptocurrencies in the late 1980s
It is irrational to think that the monetary powers are going to bow down