Yep! There are loads of people now who are using Bitcoin and accpeting bitcoin on their stores but ofcourse there will always be a risk on it as the price is volatile, it can go pump and dump at the same time...If you arent sure about it, then why not just go with USDT?
That is a pretty debatable statement, for example, in my country, wet and dry markets are not even connected to electronic payment apps that are used by a lot of people that I know which means that bitcoin transaction will be far lower than that. Remember that if you have a small circle of people then you wouldn't see the whole picture that there isn't a lot of people who knows about bitcoin. The quote above mentioned volatility which means that we need to address that first before integrating it into a local market but in regards to OP's online store, I think that you can always put it there so as to give people an option.