It looks like Martha Jones might be smart, though, which would be nice. I'm not saying Rose was stupid, but it wasn't an emphasised aspect of her character -- and after two seasons, hopefully the audience doesn't need the companion to be slow on the uptake to give the Doctor an excuse to explain everything.
Yes! A companion who can outdo the Doctor in *something* (even if it's only a small branch of science) will be a welcome change. It's difficult to construct anything approaching an equal relationship when one of the people is incredibly brilliant at everything and the other isn't.
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The Glass Half-Full Option