one of the points of creating an open standard is to push competition. you dont need multiple standards for that...
if technology advances there will be new standards (like h.264 following mpeg-2)
having two comparable standards at the same time does imho more harm to the customer than that it helps, because he needs (to pay for) more tools/patent holders, making it more expensive for him without giving him better quality/performance than in the case of one standard being used by all
additionally i dont see vc1 as being able to keep up with h.264 technically, so all in all i actually support Dark Shikari's opinion of vc-1 being useless
but thats just my opinion