My DH has NEVER done a night feed, or anything else for that matter. For what it's worth, I BF'd all mine, so he couldn't actually feed them BUT he has always said that it is part of my job to protect him from broken nights because he has to go to work. Therefore, it is also me who has always dealt with any issues that come up during the night, illnesses, wet beds, bad dreams, whatever.
But then, I could count on one hand the number of nappies he has changed or baths he has done, or meals he has made, or anything else. He's not what you could call a very hands on husband and father, and we have 5 kids.
I would say that he is likely to be exactly the same if you have another child. Only have another if YOU want to as well, and if you think that you can cope with another. Hopefully by the time another child comes along, your wee boy will be sleeping through, so you will have only one to think about during the night. Don't bank on it, though, my 7 year old DS4 still doesn't sleep a whole night.