The main threats to Bitcoin are widely known, like 51% attack, Quantum computing breaking criptography, etc.
But based on this:
Although we all wish Bitcoin will some day be the #1 in value exchange worldwide adopted, it's easy to see that economically speaking Bitcoin is still a dwarf.
I can imagine many reasons Bankers and/or Governments would want to shut down and forbid decentralized trustless criptocurrencies. So what is stopping them to do this?
You'll say: 1st they ignore you, then they laugh at you, then they fight you and then (maybe) you win.
In my opinion Bitcoin economic size puts it in the "they laugh at you" level, as we can see MSM is doing in this:
https://news.bitcoin.com/mainstream-journalist-makes-bizarre-attempt-at-living-for-a-week-using-bitcoin/If I'm right, the next step is "they fight you".
How do you fellows see weapons and tactics to take Bitcoin over by a powerful agent? Don't even need to bring a counter-attack tactic, just how would you smart guys do that if you had unlimited economic power.