While Labour 'reflects', attempting to 'listen' to these lost constituencies and trying to re-connect with their lost base, they may find themselves talking to themselves without any opportunity to win them back until the next global financial crisis.
Labour's existential issue going forwards is that Boris may be smart enough to deliver tangible goodies for all the Northern constituencies that supported him, and also invest enough in NHS to make quantitative improvements. I'm sure the Tory membership and party workers are so motivated right now, and there are lots of jobs and positions up for grabs for people who can make a difference.
This momentum hijacked party has good educated youth understanding, but knows nothing about the rustbelt working class. The Tory slur about the 'Islington elite' makes total sense to me now. It's Hilary and the Democrats all over again.
As someone who believes in democracy, I'm willing to give Boris 2 years of objective support to see how he does. Maybe Im totally wrong and that Brexit will be a massive success which causes huge economic growth. And maybe he is also a genius who can read the British public and their needs better than all the others in the centre left and left. Boris has now proven twice that he has a better read of the working class than anyone in the Labour party (referendum and election).
The Conservative Party took the centre ground that Corbynista's found so dirty. They now have the opportunity to make Labour irrelevant for a generation.