Quoted from Litedpinballmods:
This specific question was asked of Gary Stern in Orlando. His answer was very simple and consistent to what he has said for many, many years. Who overseas knows about Stranger Things? He then quoted Guardians of the Galaxy first move, $850,000,000 gross ticket sales, Guardians of the Galaxy II, $900,000,000 ticket sales and they are making a third movie.
If their is no overseas interest, Stern is not interested.
I don't know how to get viewership numbers out of Netflix but the show is a massive hit. Him quoting ticket sales just makes him sound like an idiot. If internet subscriber numbers are accurate Netflix pulls close to $2,000,000,000 a month. The guy is so out of touch.