Are you proposing to change the nature of Bitcoin from a peer-to-peer payment system to a museum of unique Bitcoin amounts? For what? So that it becomes impossible to actually pay them?
of course no..
this has nothing to do with peer-to-peer nature of Bitcoin / any other crypto system. and you can still pay them. just an optional feature in case of request - mostly by enterprise entities.
The number of bitcoins is limited, there will not be more than 21 million. Therefore, any option to irreversibly convert any part of bitcoins into NFTs will reduce the overall supply. If this becomes popular, then over time the number of bitcoins frozen in NFTs would become too large for the blockchain to continue to function fully. Therefore, Bitcoins should remain freely fungible.