I agree - the article kind of lost purpose midway in the first paragraph, so I skimmed it too and found it with an atrocious closing paragraph.
My wife is generally averse to sci-fi, so what I always make sure to do is point out when an 'ordinary' movie is using sci-fi and it becomes disturbingly long.
I like to point out movies like Inception (being a big one people don't see as sci-fi even though it is pure sci-fi), Donnie Darko (a movie about time travel), V for Vendetta, Frankenstein, Jurassic Park and the funniest I've had to point out has been E.T. And that's without even having to step out into the 'grey area' where movies are using sci-fi 'concepts' or just using mild sci-fi elements.
It also works to point out that almost 3/4 of horror movies are still solidly sci-fi.
I think sci-fi's death will be when it becomes so mainstream it's rarely differentiated from regular fiction, which with a lot of movies it's still hard to convince people it's sci-fi. I mean 'Click' with Adam Sandler is a great example. It's sci-fi through and through, but because it's using only 1 element people won't believe it's sci-fi.