When Ethereum finally becomes the biggest blockchain by market cap 0xBTC will become the BTC emulation that is used as a deflationary store of value on that blockchain.
Bitcoin will die and cease to be a blockchain of any importance and people will switch to investing in 0xBTC which is compatible with the Ethereum network.
Maybe yes, maybe no, but i think not, btc will not die in my opinion, for me btc the root of all next is the altcoins.