I buy my groceries online
The top thing that could be done to make me buy my groceries online is...
Personally, we almost never do online shopping because we live a five minute walk from a large Sainsbury's, and so I just get off and pick up stuff for dinner on the way home. If we lived somewhere less convenient then I'd be very tempted to do a lot of it.
And I think the article might be right that most people don't actually want to do their grocery shopping online - it just doesn't add enough convenience for them.