The article stated if moisture appears between the panes, not on the panes then it would need to be replaced. Humidity would not cause that to occur.
There are many attractive double panes available, but purists might still wish to use non uPVC windows. However, many composite materials are available that look just like real wood, with less maintenance.
I have found that payback is not so quick. It would depend on just how bad your old windows were, and the environment that the house is exposed to.