Since it was quite a useful word that will undoubtedly be missed, why not being it back with a simple redefinition. We could redefine it as "close enough to true that only a philosopher would object". Then we could continue to use the word, despite the obnoxious objections of philosophers.
Epistemology may be all very neat and interesting, but in the real world there is little place for it. We frequently need to express ideas that may not necessarily be "philosophically pure", in order to get shit done in a timely manner. Think of the concept of "fact" as foma.
It is great that you aren't. The issue is that the author of the article was nitpicking a non-controversial use of the word. His son's responses to him suggest to me that his son was sick of his philosophical shit and just wanted to deal with the world pragmatically. Most people have little patience for epistemology, and I find it hard to blame them.