I may end up keeping the 7D anyway, not having much luck selling it. I did think about having two bodies, but selling made more sense to me at least financially.
here's a recommendation: buy two pocket wizards and a pocket wizard remote trigger cable. put a wide-angle lens on the 7d and a telephoto on the 5d. whenever the 5d fires, the 7d captures the whole scene. works beautifully for sports.