Let's take into account also free site submitters. For example I had most of sales from non index pages. One of the biggest point of FS concept is surfer is thinking he's on paysite. New cooncept will make surfers more "automatized" => less sales. Of coruse, that it is good idea something to change on old concept. My idea is, let's keep old concept and prefer also these rules:
1) All sites in the same directory + just one subdir - for example
http://www.abc.com/abc/index.htm ;
http://www.abc.com/abc/main.htm etc.
2) No more that 50 free sites for one domain
3) Strictly no mirrors