But that isn't what your source is saying. They state that 63% of all players drafted in the first round become what they call "career players" which they have defined at 200 games, not 1000.
As for JvR I think the next year will be his "make or break" year where he'll have to perform for the whole season (if he stays healthy that is), if he doesn't I think he risks being traded.
Thanks very much for this clarification. I was speed-reading and saw 1000 games and the term "career player" and put them together. Doh! My general point still stands, but score an F on attention to detail.