I hope to heck not for a million reasons:
1. what a frickin tragic waste of internet bandwidth. Everyone has to suffer from miserable speeds for things that wouldn't make sense for physical distribution just so people can stream movies in sub-standard quality (audio and visual) and then we have to listen to them complain about how their fancy new HDTV barely looks better than their old SD set and that HD looks barely better than DVD, if even. Really???
2. as already mention in point one, the quality is poor, many people only get 1-7Mbps typical internet speed and that is a far cry from 20-40Mbps of physical media (and we aren't even talking 4K yet!), at least in the U.S. we are sooo, soooooooo far from the age where we have the bandwidth to stream 7 channel lossless audio and physical media quality compressed 2K video never mind 4K, one day we will get there but that appears to be a long way off still, and don't forget that is for ONE stream with zero bandwidth left over for anything else so we need a good 120Mbps, constant, all times of the day, to every home before it begins to even make sense for 2K video and more like 500Mbps, if not more, for 4K.
even once we get 500Mbps to every home all the time with ease:
3. what about extra? various cuts? commentaries?
4. distribution rights change, rights get fought over, suddenly maybe a ton of your favorite shows/films are gone for who knows how long until the lawyers fight it out
5. storage space and distro cost money so even if homes have 500Mbps it will be a long while until the streaming companies feel the pressure to deliver physical media copy levels of quality, maybe a LONG while and they may also cut losts of shows/films they decided are too obscure to waste space/bandwidth with
It's just nice to know that once you have the disc you have the disc. The title won't disappear. Your preferred cut might not disappear. And you get top quality audio and video and extras. Some people go insane of special edition cuts or original cuts, maybe the one streaming is the cut you don't care for and you are stuck with it for who knows how long.