I dont think small business will sell for crypto in coming future only those who are fan and risk taker will prefer payment in crypto but then comes the legal issue so unless respective government consider crypto as legal , i dont think small business will prefer to sell for crypto.
but it can be possible anyone can sell their small business for crypto if they live in that country where bitcoin is legal there is many country where bitcoin is legal so we can use our crypto for any business to buy and if crypto is illegal in any country they can convert their crypto and then anyone can buy a small or big business easily.