My theory is that they won't be small in the future. I believe that the amount of households using old technology still dominates the amount of households using new technology in large numbers. Many of those older technology households, when they eventually switch in the coming years, are going to be looking for like for like services to what they have now, just at a cheaper price, IMO.
One thing history has taught us, technology wise, is that what early adopters choose is not always what becomes the industry standard.
I believe the industry standard will be smaller, but still fairly large, cable/sat like channel streaming packages at much more reasonable costs (at least until they invariably rise as well once the majority have switched).
We won't know the final answer for quite a while though so any other guess is as good as mine.