I would suggest a google search. Only OP knows what streaming services he/she currently has or willing to pay for. If OP is asking if you can get 4K from streamed sources, then the answer is yes. I don't know why the question was asked of what is the expected quality of streamed content in the next 3-5 years. Pretty sure not many here can predict the future. I would guess and say, it will be at least as good as it is now. OP, you can purchase an AVR at a pretty low price point these days, and get many of the bells and whistles. Many only pass-through the video anyway, so that will be left to your TV to upscale to 4K or play 4K native content. These days I would not buy a device that can't pass-through 4K content. Of course, I'm the same person that would not buy a TV that is less than 65", regardless of where I plan to put it.