The issue is how valuable all the digital data is (as well as hiding bad news) meaning they wont want to release the data.
In adding free 2 play you also have the issue of how? Do it by revenue? All those Indies suddenly need to sell 3-10x as many units as AAA and full price retail.
Are the charts to track volume or revenue in such a case?
One thing is for sure. Software charts are going to become increasingly irrelevant.