Ruled out but it needs to be ruled into law to counter No Deal as that is in law.
Which would probably happen, following an overwhelming defeat in tonight’s vote.
Therefore, the question is still valid. If both are voted no on, surely the only option left is to rescind Article 50.
Also, even if there is a YES vote to an extension, EU would be completely justified in telling us to **** off. With no extension, and no appetite for No Deal, there would literally be no choice but to rescind Article 50.