That last paragraph is a downer... Unlike film cameras, DSLR cameras you already own are going to be harder to maintain, if at all, and then what happens to all the thousands we spent on dslr glass...
I love my lenses because of the photos they give me. And I totally disagree with this article. For every DSLR person that goes mirrorless there are going to be 10 iPhone photographers that go "pro".
Well, if you don't wait too long, you can get a lot of it back. I sold my D700 + glass, and made $3300, which I used to buy a lovely OM-D system (12, 20, 25, 45, 75). I use my camera much more now.
With film it isn't any different and it should be no surprise that digital devices suffer from this too. There has to be some lower limit for medium+device longevity.