Nah, it's just the 3 for now. Though I wouldn't be surprised if at least one of Perrin and Faile's kids can channel, what with the Mantheren blood and all. So Saldea is another option.
I don't think we know for certain which side of the family Rand got his channeling from (Tigraine or the Aiel side), but we do know House Damodred has at least one channeler (Moiraine), so it's possible Galad could have the genes from either his mom or his dad's side, meaning his and Berelain's kids might be able to channel as well.
I doubt there are many channelers in Tairen noble houses, so I doubt you're likely to see anything from there.
Other borderland countries (besides Saldea) are also potentials. Who was it that had a sister in the Tower? The king of Arafel? I always get those guys confused.
Other than that, I don't think we know enough about the other royal houses to say one way or another about the future.
I don't think we know for certain which side of the family Rand got his channeling from (Tigraine or the Aiel side), but we do know House Damodred has at least one channeler (Moiraine), so it's possible Galad could have the genes from either his mom or his dad's side, meaning his and Berelain's kids might be able to channel as well.
I doubt there are many channelers in Tairen noble houses, so I doubt you're likely to see anything from there.
Other borderland countries (besides Saldea) are also potentials. Who was it that had a sister in the Tower? The king of Arafel? I always get those guys confused.
Other than that, I don't think we know enough about the other royal houses to say one way or another about the future.