The prospect of the EU enforcing a hard EU exit on the UK might be a show to discourage other national exit campaigners across the EU. Many European politicians have been very happy to beat this drum the last few months. Likewise, its possible the Canada deal failure is just a show to convince the UK the EU means business. Its not necessarily a failure by the EU machine to negotiate a deal, its quite possibly a deliberate act to make their life easier after we trigger the Article 50 process, which, as said above, has much grater economic implications for the EU than the Canada deal.
In any case, everything the EU has ever done or will ever do, on every scale, has to be seen through the lens of its primary objective, European political union. Trade and the Euro are just tools to help it lever nation states towards this end. Introduction of the single European currency under dubious compromise conditions that made its failure all too probable can be seen in this way - a remedy for these issues could be political union. Failure of the Canada deal, a tiny issue, could have been avoidable if there had already been political union. Exit of the second largest economy in Europe from the EU could likewise have been prevented, and political union would stop anyone else flying their own exit on the back of a successful Brexit.
In any case, everything the EU has ever done or will ever do, on every scale, has to be seen through the lens of its primary objective, European political union. Trade and the Euro are just tools to help it lever nation states towards this end. Introduction of the single European currency under dubious compromise conditions that made its failure all too probable can be seen in this way - a remedy for these issues could be political union. Failure of the Canada deal, a tiny issue, could have been avoidable if there had already been political union. Exit of the second largest economy in Europe from the EU could likewise have been prevented, and political union would stop anyone else flying their own exit on the back of a successful Brexit.