I don't believe that "must be the husband of one wife" means that marriage is a prerequisite, but I do think pastors are better off if they are married.
Not because single people aren't capable because we are, but it's very hard being single and having multiple responsibilities in one's life. Trust me on that one. Going it alone is hard when in various places of leadership.
A pastor who shepherds a church bears a great burden of responsibility. That list of qualifications found in 1 Timothy is pretty tough to follow if he doesn't have a wife to help him. I'm not speaking of her washing his clothes and cooking his meals and doing all of the grunt work, that's another thread altogether...
I think a pastor needs a wife.
The book of Genesis says that that only thing that God saw in all of His Creative Genius was that his first created human being was alone.
Go back and take a really, REALLY good look at those qualifications of a church leader. That's a tough standard to measure up to and I say this in all respect....do most of our church leaders genuinely measure up to the literal letter of that list...100%?
I don't see how a man could be a pastor of a church and strive to meet the biblical qualifications of that list and not have a strong, humble, and gifted wife to give him constructive criticism, pray for him, soothe his spirit when he is down, stand beside him like a lioness when the church doesn't support him, help him in research and teaching preparations, listen to his private struggles and fears and calm them, be an example of patience, blamelessness, good behavior, hospitality, leader of the children, and so on.
In fact, verse 11 says that their wives must be just as diligent in that list of qualifications.
I don't know how a man could be a pastor who meets the qualifications of 1 Timothy without a competent, wise, and resourceful wife who loves him so.
Nonetheless, I just don't see where this passage is stating that a pastor HAS to have a wife.
There is an underlying tone of "assumption" that the majority of people DO get married. Just as God told the Israelites before they crossed over into Jordan for their future kings not to multiply their wives unto themselves, I think that same principle is what is being asserted here. An assumption that in the case of marriage because that is what the majority of Christian adults do.
"bone of my bones, flesh of my flesh"...."a man (singular) shall cleave unto his wife (singular) and they shall be one flesh"
You can't have that Godly state of mind when "married to" more than one woman.
A wife is VERY important to a man....the book of Genesis said so. And a pastor's burden of responsibility is VERY heavy....the book of 1 Timothy said so.
And while it doesn't mean that he has to have a wife.....I don't see how he is as effective as a pastor as he could be without one.
On the other hand, and because a Godly and gifted wife is so important, I would much rather see a young single pastor preaching the word and shepherding a church for a while alone and single, waiting for God's choice of a wife for him than to see a young single pastor feel pressured into getting married to albeit a very nice woman, but not God's choice for him just for the sake of appeasing a congregation.