This obsession with "permanence" is the lamest catch ever. There's really no such thing as "permanence" in showbiz, for one thing. One day you're hot, the next you're not... and someone else becomes the big thing.
The rapper Ja Rule had a good sustained run where he "crossed over" and ruled (no pun) over the pop charts. And then he fell off. According to your definitions, he never actually "crossed over" because he didn't stay on the pop charts forever.
But why can't we just extend the logic? If your thinking is correct, then ANY success that is not permanent is failure, and ultimately nonexistent. Julia Roberts was never America's favorite actress because she's not as highly rated today as she was back in 1996. Or Nicolas Cage, who went from obscure bit parts in movies like Fast Times at Ridgemont High, to becoming America's #1 movie star and an Oscar winner. Today, he acts in hundreds of movies that nobody ever heard of... so I suppose his "temporary" period of success does not count, and ultimately his career has been unsuccessful.
See how ridiculous that sounds?
And appealing to the authority of your "well-known actor" friend is even funnier. Like, because he's a "well-known actor" he defines the terms? Or perhaps he gets to read from the secret book of rules and regulations that is issued only to well-known actors.