Bitcoin can *NEVER BE* a lot of what Monero already IS and that's not likely to change, ever. Most other altcoins? Not so much...
There is nothing standing between xmr and it's successor as the primary legitimate fungible digital cash except marketcap. Admittedly overcoming that obstacle can be challenging, but it is a vast, fecund, and competitive space. The sooner we get back in front of ethereum, the less I will worry about the marketcap moat.