Are there companies that ask for work samples (like yours)? Yes. Are there companies that rely more on resumes and interviews? Yes. Is the ratio going to change substantially? Possibly! It's an experiment, and like all experiments we're still waiting for the data to come back.

I think interviews and references are far more important than a skills test. You can train or educate almost anyone on most, if not all, skills. You can't train people to be decent coworkers emotionally.