I'm not too sure. France is not too keen on granting extensions for the sake of it and it only takes one country to refuse.
Everyone thought that by now we would be negotiating the future relationship, and the UK is still bickering with itself over the withdrawal agreement. I can see other countries getting tired of it, especially if refusing the extension can end this farce in a way that suits them.
If no deal is made impossible by law, the EU could refuse the extension on the 10th, and the government would have very little options but the repel A50 by the 12th