Innovation increases productivity for electronic goods at a very rapid pace, and can even make up for raw materials and labor cost increases (if they made DVD players now the same way they made them just 3 years ago, I would expect them to be MORE expensive now than they would be 3 years ago).
This isn't quite so true for non-electronic goods.
For this reason, I do not believe that consumer electronics prices are a good measure of the economic effect of various polices. What they are a good measure of is just how fast technology is advancing.
They are one of the measures.