While we would be "stuck" with her if this unlikely scenario were to happen, I rather think she'd be perfectly fine for the job. Plus, if she were found to be unfit for it, we do have a chain of succession whereby she could step aside (by choice or force) and the next person in line would take over.

If nothing else, I firmly believe she's more a more competent leader than Obama can hope to be right now. Starting with a 10 and the risk of having to fall back to an 8 is better than started with a 5.