Could also put the business at risk of getting questioned due to the high inflow of cryptocurrency transactions and I think some fraudsters will begin to make use of that physical store to covert their stolen cryptocurrency to valuable things that they can buy in the store. It'll make the physical store to become popular and also help to spread the messages on Bitcoin adoption but anyone that wants to do this has to be ready for the negative things that'll accompany such a move especially for small brands that aren't well known to not be accused of being used for money laundering and other crimes. The sales in the shop will likely increase but so will the attention.

Can increase sales of physical stores, if their market is mostly Bitcoin users. But if the market of the physical store that uses Bitcoin is only a minority, it will not have any impact on store sales.
What is done is only to help store customers to choose other payment options that help customers comfortably. Customers who have Bitcoin do not need to withdraw to fiat first before buying goods/services offered by physical stores.

these days it seems that people are becoming more reluctant to use their bitcoins in physical stores, because they understand that holding bitcoins can give them more profit than just spending it on goods that can be more easily purchased using fiat. and even if the physical stores open payment methods using bitcoin or popular altcoins, it will not increase their sales either, because besides crypto owners choosing to hold themselves to spend their crypto, they also consider the waiting time and fees on the transaction. but it would be cool if physical stores make payment methods in bitcoin or popular altcoins, at least customers can get more options on their payments.