I would be more than happy to just see my local grocery supermarket accept crypto for a start instead of dreaming about some big name accepting crypto.
Most app wallets set the fee to be accepted in the next 10 minutes this will be harmful for the user, if the network is overloaded some fees can be from 10 to 15 USD.
And if you setup manually that fee to be the minimum it will take some hours for the transaction to be accepted.
I really like bitcoin but most user don't know how it works and also they don't care they want to buy groceries and stuff instantly, and that will be a problem for small business or small transactions to be accepted faster.