Blended learning - no shape, theory, methodology or best practice?

A good post by Donald Clark - Blended learning - a sugar coated pill where he suggests that Blended learning is code for coping with a change in the model. While we've been doing blends for years, certainly the use of the term and the composition of the blends is changing. One example of that I discuss in: Start with Courseware or With the Other Stuff?

As we see the shape of things begin to change, I'm concerned as is Donald when he tells us the term "blended learning" has "no defined shape, theory, methodology or best practice."

Is this then similar to Informal Learning is Too Important to Leave to Chance where we need our design models to catch up to the demands of the world of learning?