When we take a look at the SAP product roadmap for SAP BusinessObjects Dashboards, we see that there are almost no more planned innovations and future directions named. On the other hand, the product roadmap for Design Studio is packed with new features. Also, Design Studio has quite a steady release schedule with a new version every six months.
You can find the most recent versions of the SAP product roadmaps at http://service.sap.com/roadmap.
This is in line with the statement of direction for dashboarding that was published by SAP in 2012. Eventually, the goal is to integrate SAP BusinessObjects and Design Studio into a single dashboarding tool.
To read the statement of direction, visit http://blogs.sap.com/analytics/2012/04/17/the-future-of-dashboards-strategy-and-direction/.
Although there are no concrete timelines set as yet, we can expect SAP to support SAP BusinessObjects Dashboards for a very long time as it has done so in the past. But it definitely would be a good idea to start looking at Design Studio and to stay up to date with the ongoing developments.