The digital marketing world is different than it was just a few years ago. If you grew up on SEO keywords and HTML website coding, you’ve seen the industry come a long way. Old Google algorithms give way to new. The world rushes from desktop to laptop, to cloud, to virtualization. Everyone is always embracing the next new big thing. Here’s one of the biggest new questions that digital marketers wrestle with as they try to help companies come up with comprehensive plans. What about channels? Marketing channels have grown from a tiny seedling into an enormous shrub, and that’s not likely to reverse course any time soon.