"This job would be great if it weren't for the parents."
I've heard principals say that more than once, and there is some truth in it even though 95% of my experiences with parents as an administrator have been positive. When leading blended learning, your interactions with parents are going to be the key to success.
Now at this point you might think of everything else you have to do to get blended learning going in your building: convincing teachers it's best for students; shifting classrooms from teacher centered to student centered. All of that is important, but how you handle parents will make or break it.
Whenever you have a new innovation in the classroom people are always watching to see what happens. And typically, as long as it doesn't affect little Johnny's grades, parents are pretty quiet about it. With blended learning, it's going to require little Johnny to start doing some things he hasn't had to do before. And while I would expect little Johnny to enjoy his school experience more now that he has more say in his learning, not everyone is going to react the same to it. Some might even look at it is being extracurricular and thus something they don't have to do.
Here's a scenario: Ms. Johnson has fully embraced blended learning in her U.S. History class. Ms. Johnson has started assigning discussions for homework to continue the rich discussions they're having in class. Little Johnny doesn't feel like it's fair that he has to do discussions after school so he just doesn't do them. He gets a 0 for the assignment. Little Johnny's mom calls to complain. How do you react?
It's easy to say that you tell her that online work is now an expectation of Little Johnny and he has to do the work, and he gets a 0 because the class has moved on from the discussion and it's of little benefit for him to do it now. Or do you bend and tell Ms. Johnson not to require the discussions and just make them optional instead?
The more you bend here the more likely your teachers are going to get turned off to blended learning. You must hold the line. It's not easy, but nothing worth doing ever is.