Yes, we should re-think it and abandon it.  At least so far as a rigid construct of work goes.

One of the most unchanged elements of our life today is our optimal work time or how long we should work – generally, every person I’ve spoken to quotes me something close to 8 hours a day. And data seems to confirm that: The average American works 8.8 hours every day.

The origin of the 8 hour work day and why we should rethink it