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.
You just called it an emulation and simply shows no reason of an extra value it adds to make it turn the legacy bitcoin to becoming an obsolete. I guess rather than bitcoin dying, this would be just another wannabe that will end up the drain eventually. One thing I have always never paid much attention to is emulation, better to come up with your own idea as a developer, push it and see how far it goes and not just some form of trying to clone the real one and pushing it as a better coin.