Now a result I can believe in this vein would be: "that attempting to lean heavily on sentence construction and grammar exercises to induce speaking could have

Now a result I can believe in this vein would be: "that attempting to lean heavily on sentence construction and grammar exercises to induce speaking could have a negative effect on language acquisition" and that's what I believe Stephen Krashen is actually advocating against. But that's a very specific claim as opposed to "avoid speaking".