Last month, Danny Sullivan revealed that search marketers were to lose a new source of referrer data - iOS 6 Google searches.
While this won’t destroy the Search Marketing industry, it will make our jobs harder. Being able to see where traffic is coming from (searches, direct or otherwise) allows us to tailor our sites accordingly. If we know what keywords people use to find us, then we can make sure we have those in place on the site. Knowing that 60% of traffic comes from Google while 40% comes from Social (as a crude example) means that campaigns can be adjusted to focus on one source over the other.