I agree with Catman. I have almost 9000 greenpoints at the moment and came very close to ordering 3 more Delta certificates last weekend (when they were still 2500 points each). I didn't because I'm about to go out of the country for 2 weeks and didn't want them hanging around while I was away. Now I'm sorry! They really should give people some advance warning before making such a dramatic change. Even when the airlines change their programs -- which they certainly do -- they always give lots of warning.
Bruce