Don't think that bitcoin will be the main payment method. It may even only attract up to 20 customers in the first few days, who then slowly return to conventional methods. Then it won't affect the OP's business too much.
Paying bitcoins for small transactions still comes with a fee, anyone would consider using it rarely.
That's what I've realized about 3 hours after I posted that reply and you're right it won't affect but I haven't really seen anyone really use bitcoin as a means to pay for goods and service. Maybe big business that sells products at higher price might be able to do it but then again, it comes to the problem I presented.