Trying to reach a definitive answer to whether Krashen is right or wrong is the same as attempting to decide whether art or science is superior in the teaching of languages. And I certainly am not foolhardy enough to respond. I leave it to you to decide whether you care to continue a debate that has been ongoing for centuries.
Garon Wheeler: Krashen, A Victim of History, in: TESL Canada Journal, Vol. 20, No 2, 2003
http://www.teslcanadajournal.ca/index.php/tesl/article/viewFile/951/770