Carry Fisher didn't even realize that was not her in Rogue One, she thought it was pulled from her filming of A New Hope
She was going blind then.
It was obviously not her. Skin too shiny. Now I will admit that there were times when Tarkin was on the screen and the shadows were overcast enough to where that shit looked AMAZING.
Best facial CGI I've ever seen in anything. (Although Gladiator and Fast and Furious 7 were really good in their own right.
That said, I don't know about 2020 completely, but within 10 years, you probably won't notice anything ever.
You don't realize how much is CGI already. Remember, you only notice bad CGI, you never notice the good. You just think it's a person or a city or a car or whatever. To you, it's the real thing.
It's not unless you're making it or have access to the green scene behind it that you would be amazed by it.
Some of the shit you just don't realize is CGI, is fucking animated as all get out.