For what it's worth, from TFA:
While 75 percent of students in 2012 said, before Mumper’s class, that they preferred lectures, almost 90 percent of students said they preferred the flipped model after the class.
So it looks like the backlash is relatively minor.
With this material, most students don't need huge swaths of time to do the assignments if supervision is available. It's not appropriate for all levels of instruction or all subject matter, but when there are a lot of fundamental concepts that need to be grasped, the fact that you're no longer doing the work in isolation at home is the real source of the improvement. There's still a final assignment where the students have to prove themselves, in case you're worried of overdependent students.
It is also very strongly wired into our brains insofar that I would consider it part of the human condition. Marginalizing people for showing this behaviour is never going to end well.
Mild objection—discrimination is also strongly wired into our brains. It's only been in the past century that the objectification of women has become so overt. As far as sensitivity is concerned, this event was backward from previous social norms, even though huge improvements in discriminatory behaviour have occurred over the years.
I don't want to achieve immortality through my work. I want to achieve immortality through not dying. -- Woody Allen