I was very upset to read following tweet from @Contentverse:
The tweet is basically related to this article, again published on Contentverse Blog, which claims that the Box and Dropbox are not document management system. Go ahead and click here and read the article first before proceeding further.
ECM being shredded by cloud storage Credit: Thinkstock 
As per a recent article on CIO.com, companies are opting for smaller, more specialized and customized solutions as opposed to bigger, more well-known brands. This is partially the result of digital disruption; business is moving faster than ever and competitors are cropping up where companies least expected them. You need to be able to move quickly and move according to the specs your organization needs, not the specs that an enterprise giant assigns to most of its customers. ECM isn’t dying at all. It’s living a renewed life of specialization and customization.
Is the future of ECM software in the cloud?
SearchContentManagement did a two part series on future of ECM in Cloud, you ca read it here (part 1 and part 2). As per this article it’s clear that despite many challenges, growing adoption suggests that ECM in the cloud has a future, many vendors have already started to offer hybrid model.