Well according to Google.
YouTube: From $4.99
iTunes: From $4.99
Amazon Video: From $4.99
Vudu: From $4.99
Google Play Movies & TV: From $4.99
the world has moved on from DVDs.
Everyone I know still has the means to play a DVDs even if they don't use them as often as they used to. In a world where some people have data caps and limited speeds, I don't think the world has moved on.
Besides, I can't count on streaming options to reliably have the same offerings on a consistent basis. My physical copies work and if they stop, I can rip them to make sure they still do.