Many people can migrate to eth if they want to, but something im sure it won't happen is someone taking the first place from bitcoin.
Eth is innovating and their fees are probably going to be cheaper, yeah. But it always going to be an altcoin, second place, etc.
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I would not have any problem if ETH, though too hard, was able to outperform BTC.
PoS Bitcoin in future may shock all of us, though 😌