With the version of Fitz we have now, my answer is no, we cannot win a super bowl with him at QB. He is too inaccurate and he turns the ball over too many times.
But I am a fan of his. He is still young, and he is tough, fearless, and doesn't get rattled by mistakes. I also think that right now he is better than anyone in the draft. Most importantly, I am very optimistic that there is great room for improvement, especially with Chan as HC. I think in two or three years he could improve to pro-bowl level, or maybe near pro-bowl level, which is absolutely good enough to lead a team to a super bowl.