The simple answer to this thread is that interaction design is going wherever it’s practitioners will take it. In the place where I’m working at the moment, for example, we have stopped reinventing the wheel and now we’re looking for re purposing standard solutions where millions of dollars were already spent on developing them. A lot like trying to convert a spoon into a fork. It’s the best business strategy which suits our company best.
So to conclude, interaction design is following it’s master company’s business strategy. Sure, there will be individuals in universities who will be developing totally off-the-wall principles, but only a small percentage of these will end up in industry. Just keep on looking at developments in contemporary industry-standard solutions and that’s how interaction design will go.