Truth be told, Big Tech cloud services (AWS, Azure etc.) have so much CPU horsepower that it is
indeed possible to execute a 51% attack against Monero.
That thing is no longer possible in Bitcoin (as it was back in 2010-2011) due to ASICs (more security, at the expense of reducing decentralization a bit).
BTC vs XMR tokenomics are totally different and if you ask me, I believe the human population will experience huge deflation in the coming decades, so a tail emission is counterproductive (unless you
really believe the human population will keep increasing).
It's
fine to have both cryptocurrencies in the market, just like it's fine to have both Linux and OpenBSD (security-hardened UNIX by default). No need to fight over it.

You don't even need to perform a 51% attack on Monero. Since it's a black box, anything goes. If you cannot audit the blockchain, then you have a problem, since you cannot guarantee that nobody is exploiting an unfixed bug, such as, inflating the supply, double spending, or anything in between. This is the double edged sword of anonymity and fungibility.