What you propose seems a little more all encompassing than most ideas to modernize the CPAN (and related services) experience. But hey, since you're bouncing ideas around, if you haven't already, you may want to drop by the rethinking-cpan mailinglist Andy created (Update: Check out his related write up, too.). You may receive more focused feedback there and, once you're ready to put your idea into practice, that would probably be the best place to recruit help.

And for more on the pain of the CPAN Ratings system and a mini pro/con debate on "improving" CPAN in general, pick through this conversation from the perl.qa mailinglist.