Read the text and determine if the sentence is true:

His Excellency: George Washington is a 2004 biography of the first President of the United States, General George Washington. It was written by Joseph Ellis, a professor of History at Mount Holyoke College, who specializes in the founding fathers and the revolutionary and federalist periods.

Sentence: There will most definitely be more books written on the subject of George Washington by Ellis.
It's impossible to say