It is funny you are writing this article, we are actually working on such a system and have even purchased one of the new vanity domains for it http://opensim.directory/ which is set to launch soon. It will be a module grids can install to be a part of the statistical counting, the module will be PHP based and will require very little effort to install. It intergrates and scans the grid's database and then pushes the statisics via JSON to our servers which then collect every 12 to 24 hours to grab everything from region names, grid login statistics, and more.
I am looking at possibly adding an LSL version to have the ability to have better region tracking, and for those who do not own a grid or a part of a grid that hasn't decided to fully participate.
Remember at Zetamex we are pushing the envolope to make new and better things for the metaverse because we care and want to see better and more accurate statistics.