If Marissa hired me, I'd tell her, "Throw away everything and focus your team 100% on search." Search is her core competency -- so stop pretending to be a media mogul and get down to what you know best. Web search is far from done, and it has loads of potential. It's her "iPod."
How ironic would it be Yahoo displaced Google, because Google had lost their focus on doing one thing (search) and doing it really well?