The flipped classroom seems like a pretty good idea. If a kid had the choice of a homework assignment, I think 99% of them would choose to watch a video over doing standard homework. It also gives the teacher the opportunity to watch the students practice.
The linked article mentions a potential con thats rather unfortunate. If the idea of a flipped classroom becomes too popular, the idea could backfire. If every teacher were to run the classroom this way, students would go home and spend hours in front of a computer screen. That is something that parents likely wouldn’t be too happy with.