The growth in the SD-WAN market comes despite the fact that last year, there was still more hype surrounding SD-WAN than actual adoption in the channel and end-user markets. Right now, SD-WAN adoption is hovering around the same place where unified communications as a service (UCaaS) was two or three years ago. The technology, in other words, is still at the beginning of its multibillion-dollar bell curve.  2018 is the year that everything will change.  Here’s why.