The most recent Academy Awards show was the lowest rated in a decade, and it got 26 million people in what's called "live plus same day" which includes for people watching on their DVR's shortly after.
That's 26 million people in just a few hours for one show in one country. Amazon's five million came from 19 shows, "airing" across an entire year, in however many countries have Amazon Video.
If you were to break it down by same-day viewership, Amazon's ratings are lower than a local news show in a very small market.
I'm not criticizing Amazon, at all. I'm a paying subscriber and think it, Netflix, and similar services are a better vision of the future than what the broadcast and cable nets have put together. But it's way too early to tout the death of the broadcast industry, as so many like to do.
Also, The Grand Tour is awesome.