Drew McLellan wonders Why is Progressive Enhancement so unpopular?:
Simon St. Laurent touched on this as well in Web Application Development is Different (and Better):
Let’s extend the Web and help it do more – but let’s do that by valuing the many strengths it already brings.
Intentional or not the last few years have brought us a strong push to ignore the idea of progressive enhancement. In many cases that has been to our detriment.