The problem is that mainstream consumers don't want nor need voice control. Voice recognition is good enough, but handling of free-form commands is a problem we haven't solved sufficiently well for mainstream enjoyment. Old people is rarely a target demographic for anything.
* "I want to read the New Yorker"
* "Open the article about traveling in India"
* "Open the email from Jennifer"
* "Open the attachment"
* "Attach the document I just edited to a reply to Jennifer"