Yes, he will eventually sleep through the whole night, but by that time mom has probably gone crazy. This again is the typical age for a power struggle and really the only answer is to put the baby in its bed and say goodnight. If baby cries, check baby to see if baby is OK, and then leave baby alone and don't go back in. Sitting in a dark room, screaming gets dull fast. When baby realizes no one will be coming, baby will go to sleep.
Babies are very sensitive.
If they sense that mamma is wishy-washy and that she might come back, they might scream up to a week. If baby senses mom is not coming back, and mom is firm, then it should only be one to two nights. They will scream and scream. This is no different. The parent is in control.