Over the past one and a half years, Stack Overflow has lost around 50% of its traffic. This decline is similarly reflected in site usage, with approximately a 50% decrease in the number of questions and answers, as well as the number of votes these posts receive.
The charts below show the usage represented by a moving average of 49 days.
What happened?
To be fair™ they did at least do a little bit to deal with the existing answers becoming obsolete by changing the default answer sorting. The “new” (it’s already been at least a year IIRC) sorting pushes down older answers and allows newer answers to rise to the top with fewer votes. That still doesn’t fix the issue that the accepted answer likely won’t change as new ways of doing things become standard, but at least it’s a step in the right direction.
One thing I’ve always wondered about stack overflow is why is there only one accepted answer ever possible even though this is programming and there are many different ways of doing any given thing?