As I said chapter 11 through 14 are unit chapters and are contextually one. With all the thing addressed by Paul in chapter 11, 12, 13 and 14 how much of it was hypothetical over conditional? I would argue the present condition of the church in Corinth was not at all Hypothetical but literal. In Chapter 14 where is is said 1cor 14:6
"If': But now, brethren, "if "I come to you speaking with tongues, what shall I profit you unless I speak to you either by revelation, by knowledge, by prophesying, or by teaching?
This could be hypothetical but from the context given by the unit chapters from 11 to 14 nothing appears to be so. It is more applicable in my understand that there were those who were speaking in tongues inappropriately than not. so the grammatical term must be applied to be conditional from what has already been given. "IF" is not contextually used as a hypothetical in this context in this passage or supported by the previous unit chapters.
"If': But now, brethren, "if "I come to you speaking with tongues, what shall I profit you unless I speak to you either by revelation, by knowledge, by prophesying, or by teaching?
This could be hypothetical but from the context given by the unit chapters from 11 to 14 nothing appears to be so. It is more applicable in my understand that there were those who were speaking in tongues inappropriately than not. so the grammatical term must be applied to be conditional from what has already been given. "IF" is not contextually used as a hypothetical in this context in this passage or supported by the previous unit chapters.
That being said, it is not clear to me that an unbeliever would attend one of their gatherings. I think they were speaking in tongues either en masse or in turn without interpretation. That might have stopped after the letter was read.