Personally, I don’t agree with this and there are lots of reason why you should upgrade to SharePoint 2016.
Software industry is changing rapidly and everything is moving towards cloud. Cloud is here to stay and for a longer time.
Microsoft wants their on-premises customers to have presence in the cloud. Even though SharePoint 2013 had some capabilities to connect to cloud, I think SharePoint 2016 it is much better. On-premises customers have better path to connect to Cloud and take advantages of it.