There's regularly articles in Norwegian newspapers about how weird the Norwegian culture of purposeless walking is to foreigners and tourists, so it's probably not dead in Norway at least.
Well, we don't really separate walking and hiking in the Norwegian language (I actually had to google the difference).
According to Statistics Norway[1], 85% of the Norwegian population has taken a walk of 3 hours or less in the last 12 months (of 2014) and around half a walk of more than 3 hours.
I didn't find updated stats about frequency, but in 1998 46% of Norwegians went on walks for longer than 30 minutes at least 2 times a week [2]. I don't have a reason to believe it has changed significantly.
Is this Hiking?