With LN, it will be a reality in everywhere, I guess. LN will ensure cheaper transaction as well as faster even.
OP, can you share the place? Where is this shop located?
In my local, there's no way of accepting bitcoin because of govt. isn't allowing this here. Otherwise, I would take bitcoin as a service fee which I offer online.
That's the only way possible to make bitcoin convenient for daily use.
LN is the solution as it does not need to go through the blockchain, things are down off chain so it's faster than any coins in the market.
The demand of bitcoin is very high but the supply is low that's why the price increases and when the price increase that would affect the transaction fee, we don't want that if we are daily users as it's not feasible for any business, we really need LN.