Overall in next 20 years Monero, Bitcoin and Gold mining emissions will be quite close together. No huge differences. All will be scarce and none will have problems with to low emission.
There's no such thing as a "scarce" craptocurrency. Even JayJuanGee can play God and create them out of thin air and there's no Schelling point that forces anyone to use a particular one. Then even if there was only one craptocurrency, it would fork into several craptocurrencies because their traits are entirely arbitrary and some people would want different attributes than others. Unlike physical metals, nothing based on artificial scarcity you can endlessly conjure out of thin air has value.