If you wish to buy small items such as coffee, lunch meal and etc, you can use a smaller cryptocurrency who offers a smaller amount of security but at the same time it offers reduced fees.
Bitcoin has meant to be a store of value, just like the gold, and not for daily transfers.
and that's how it's going to be in the future. Bitcoin will remain as the biggest one and will become a full on investment asset, while the smaller crypto will replace bitcoin in various fields like the state crypto we're seeing being developed today.
and tbh, that's what I'd love to see. Just like changing from one currency to another, you'll be hopping from one crypto into another for whatever you need and it can also be bought on some corner shop like you're buying bus ride tokens.