I argue there's a value in other cryptocurrencies existing if you're a Bitcoin-only kind of guy; people will go into crypto and invest small amounts out of curiosity alongside Bitcoin, possibly make some gains from it, and sell off to invest more in Bitcoin.

Rinse and repeat unless one of those cryptos is involved in a rugpull. If someone is a newbie but is convinced of the Bitcoin-only philosophy, the crypto game can be played in spite of the financial fear porn surrounding Bitcoin to ensure further investment.

Then you'll have enough to actually use.