Is he an upgrade? Sure - but keep it in context. There are a lot of coaches who would be an upgrade.
That said, I have some concerns with Chip Kelly and I am not sure how much different he is from what we currently have. He has a huge ego, a gadget offense, and he doesn't use an OC. I think he should be considered, but by no means should he be considered a sure thing. I know my opinion is not a popular one, but I think he has some warts.