I think the major issue with Tent was that their development efforts had always been divided between two Tent servers. Tentd, the reference implementation used by self-hosters, and their proprietary multi-tenant server that powers https://micro.cupcake.io. But in a blog post in November 2013 (https://cupcake.io/blog/2013/new-tent-server), they announced that they will stop the development of Tentd and open source their multi-tenant server. The development of https://flynn.io (another Cupcake project) will simplify the deployment of the multi-tenant server. The first preview release of Flynn was announced two weeks ago (https://cupcake.io/blog/2014/flynn-preview-release).