yup, it will. breast milk works on a demand and supply basis. No sucking means no demand means no supply.
Try to get baby used to sucking from the other nipple. My ger used to prefer one over the other cos one nipple was shorter and harder to drink from.
I 'forced' her to drink from the less-prefered one by always offering it to her. Depending on her mood, i will either offer it to her first at the beginning of the feed, as she would be hungry and would suck harder for milk, or offer it as the second breast, when she would be happier and less likely to protest.
It's really trial and error.
Now, she has no prob with either and i only offer one breast at each feed.