I don’t think your business will survive if bitcoin is doomed. It would be better if you invest the small portion of what you are earning.
The existence of a business has nothing to do with accepting bitcoin. I think the op is looking to use bitcoin as a payment method for his business besides fiat. Accepting bitcoin payments will not affect or hurt the business, but simply expand the payment method to attract more customers. If the op is living in a country where bitcoin is legal, this is a good decision as he will have another customer for his business, bitcoiners.
It also depends on how the OP looks at this market, does he believe that btc has future?
Because if he is not convinced with this market, better keep his payment method in fiat.
I do agree that it will just open for another payment method in his shop.
But it doesn't mean, it will have significant effect on his business.
So whether the OP will add btc payment, is all up to him. Because this is just another payment opportunity for him