Surprising many don't know that Bitcoin has these takeover risks.
I suspect this line of thinking will usually end with "world economies are backed by military groups.", to which I have no rebuttal.
On brighter side blockchain projects that require memory bound hashing algorithms are less vulnerable to takeovers since massive ASIC farms don't work afaik. Ethereum is one such approach (but ofc when they decided to undo transaction history after TheDao hack, it isn't immutable either).
Re-writing historical transactions from before the 51% attack is impossible, unless he can somehow re-write the hard drives in each node's computer.
https://en.bitcoin.it/wiki/Weaknesses#Attacker_has_a_lot_of_...
Fwiw the history can be re-written if over a long time a miner produces a longer chain due to hash power advantages in secret; when released it would by default invalidate all transactions since the secret mining began.
I'm skeptical. That's presuming Bitcoin stays stagnant, but that stagnation could also mean its downfall.
Also "wealth" locked up in Bitcoin is only as good as your onramps and offramps into the mainstream economy, and it's quite possible that those can be legally closed off, putting you in the position of someone like a drug dealer if you want to access it.
The comment I replied to indicated violence being used to redistribute wealth. Is one not allowed to defend oneself against violent mobs?