DVDs are not a dying market, theres a fanbase who would continue to buy them. The Simpsons world app is useless without a cable provider, and unavailable outside the US. Even without commentaries, I really feel like they should continue to release them.
http://www.avclub.com/article/simpsons-will-no-longer-be-released-dvd-217796
http://m.ign.com/articles/2015/04/09/no-more-simpsons-seasons-released-on-dvd
Every episode available at the push of a button…but only if you are in the US and have a Cable provider that offers FXX, i have every season of the simpsons on dvd and i thought I would be able to continue my collection even at the current season a year pace untill I caught up with the shows current season