you would have to rip the roots pretty bad to have the plants die from a transplant. when did you transplant? if it was just a day or 2 ago, a bit of wilt could be normal. did you maybe overwater or stress them? Did you get the whole rootball? they say the longer you have the plant out of soil, the more stress...
i transplanted and defintiely had some small roots break and it didn't cause any trouble. didn't wilt at all between replanting and grew stronger after because the roots had more room to grow. you can tell if you need to transplant because your plants will be getting very dry between waterings. I couldn't go a day without watering when my plant was n a 3gallon. when i went to a 5/6gallon, it wouldn't need water more than 1 or 2x a week. much easier to manage.