There will never be a movie about Silk Road, period.
Actually, you do have one.
And I am sure there will be many more to be made.
http://www.imdb.com/title/tt3312868/
That one was a very small-budget documentary type movie. This movie was never released on the movie theaters within the United States and the near abroad. I was talking about Hollywood-scale movies, such as The Wolf of Wall Street, The Two Mr. Kissels and The Great Impostor (starring Tony Curtis & Frank Gorshin).