It's a fair question, but I don't think so. Hamilton is leading by 64pts atm, which is way too big a margin to have made a difference to Vettel. Rosberg wouldn't just be taking points off Hamilton, but Vettel as well. For example Australia, Vettel won due to fortunate circumstances. But you wouldn't think Rosberg would crash in qualifying like Bottas did. SO in that scenario, even if Rosberg qualified behind Hamilton, he'd be getting the benefit of the freebie win instead of Vettel.