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RE: How Expensive is it to Take over the (PoW) Network of Bitcoin, Ethereum or Monero? Why We Might See More 51% Attacks in the Future
I don't think the model is obsolete. Other models also have disadvantages. What most likely will happen is that we will see hybrids of PoW/PoS or other consensus mechanisms. Also, within PoW there is still quite a lot of things developers can do to make it more difficult for 51% attacks to happen.