Spoke with a Korean teacher last night and asked him about interactive ESL software. He said he had seen a lot of examples but that children don't like to study and won't use it. I guess the power and popularity of having a teacher in front of the kids is inescapable.
Same with webcam teaching. Classroom ESL is also a group social learning setting and the 2-person webcam interaction is missing this.
Webcam teaching seems more suited to motivated adult learners.