They should make weekly/dailies count for loses as well, but make it group only. That would probably be a nice compromise and incentive grp ranked, which is what really needs a boost.
Personally I think the Ranked missions should be team-only. There will always be 'that guy' who beats his head against the wall until something happens, and will queue over and over and over with worthless gear hoping to luck out on a win. As a result, everyone's rating suffers.
By restricting these dailies to team-only, your teammates already know the gear you're coming in with, and you won't be robbing the real PvPers of their rating.
I don't think losses should count towards the daily or the weekly, but I do think that the Ranked PvP missions should be restricted to team-queue.