I have said it before but it bears repeating: If you get most of your Website traffic from Google you’re doing it wrong (it = marketing your Website). Google only drives a tiny fraction of all the traffic on the Internet. If you’re seriously depending on Google for your traffic you’re cutting off the vast majority of potential traffic your site could attract.
While that’s a business decision and not an SEO decision, the search engine optimization better supports business decisions when there is other traffic data that correlates well with the search referral traffic. In other words, grow your Google traffic as fast and as much as you like — but if you’re not growing your at traffic at the same or faster rates then you’re missing out on huge opportunities.