In summary, SD WAN solutions are currently just one part of the complete future networking solution. Hybrid networking and a comprehensive application aware monitoring solution are equally as important. The integration of these into a provider's OSS and BSS platforms will ultimately be the goal.
If you normally buy a managed WAN service then much of the benefit of SD WAN will come indirectly via your Managed Service Provider. If you source, purchase and support your own WAN then buying SD WAN components yourself will mean you see the benefits directly. However, see our course on DIY vs Managed SD WAN.
In general SD WAN will provide the management and control. Hybrid Networking will provide the cost savings and an Application Path Monitoring solution will provide the detailed analysis to help you understand what is impacting on the end user application experience.