100 Mb will handle several 4K HDR streams without a hitch. How many times would a homeowner be streaming more than two 4K HDR signals at a time LOL?
Very few people will ever stream more than two 4K streams at any given time. 1080P HD only needs around 10Mb per device.
Most problems people experience are with a weak wifi signal. And you’re correct, if a home has a large number of wireless devices running at the same time, it’s helpful to use ethernet where practical even if the wifi is good to that device but especially if the signal is weak or is steering to the router’s 2.4Hz signal due to distance.
Whether you have 500Mb or 50 Mb to a given client will make zero difference in your streaming experience over ethernet.
Now if a household has several TV’s always on, and a couple of teenagers gaming all the time, then 100Mb may not be enough. Of course, in that case, it’s time to pay attention to what if any data caps your service has.
100 Mb here. 4K projector, two HD TVs, a couple of laptops, wife gaming, and multiple IoT devices.
And, keep in mind, the OP stated he had three TV’s and unless they’re newer displays all are unlikely to be 4K anyway.
So yes, for most cord-cutters, 1gig is overkill.
For the two of us in our house, we’ve done quite well with a 20mbps DSL line. Although we don’t have anything that needs 4k.
This is a very typical situation especially with the Internet of Things where everything and the kitchen sink is grabbing bandwidth.