I can't see the PS5 and xbox two being all digital. Too many places without good internet. Especially for sony.

Even without a cap, most telcos throttle connection speed down after a given number of GB has been downloaded in a month.
And even with a 20Mbps line theoric, real sustained speed is almost always lower, and often real max speed too due to rotten half mile in most houses, and using it all to download BD sized movies and games in an acceptable time, internet browsing would drop for many hours down to 56kbps era slugginess.

What are you expecting from them, actual TVs or media boxes like the Xbone or what?

Long time in tech, short time to replace infrastructure.
LTE is impressive but it approaches cable internet speeds with higher latencies, not fibre. And that also needs a lot of infrastructure.

I used to live in the Netherlands when fibre was announced at the end of the 90's. Now in 2013, 15 years later, with the government supporting the new infrastructure, in one of the most densely populated countries meaning lowest cost per distance, fibre has 7.8% market share with 6% growth last quarter.
I would be surprised to see fibre making it here in rural Ontario in the next 10 years.

Physical disk won't be phased out for another decade, there is too much demand for them to abandoned it altogether.

Google has it mainly in boxes but others like Sony have added it to their TVs.

Apple should revamp their tv box and there is that consistent rumor of some full apple branded TV. Though I'd think they would stick to just the box.

I'm hoping for a Nexus style GoogleTV box that I can get for $200 or less personally.

How do those boxes work? Would they replace a normal cable-TV box, or would they work like the XBbonex in that you need a cable-TV box too?

Pass through systems like Xbone. I don't think I've seen any with cable/sat cards to bypass their respective devices.

Then what's the purpose of such box? I honestly don't understand it.

... and that's the reason iTV/GoogleTV has not taken off.

It doesn't seem to have mass appeal yet. Not sure if its just how its being presented or cost barrier or simply not enough functionality to deem it necessary to most.

I love the idea, but haven't wanted to spend $100 to $200 to make it happen.

Having superb internet on my TV, capability to instantly access my entire Google Play library/netflix/any other digital library, search all of these plus DVR and cable channels all at once, etc, etc... nice features but for many people, most of these are already given to them by their other smart devices.

I my case I can do almost any of that with my WiiU. Maybe not as streamlined, but its easily done to the point I don't want to spend the $$ on another box. Others can do most with their PS3s and definitely upcoming consoles or in a lot of cases their DVD/Bluray/TV sets themselves.

Though I would buy a GoogleTV device if it was:

1. A "nexus" device; i.e. a pure android OS system
2. Could sync via NFC to my phone so I can instantly stream all media from anywhere in house (google "Google Q" device for audio examples)
3. Less than $100. Hardware doesn't need to be powerful and doesn't require much storage if any, just solid OS. So it can be a fairly modest setup.