Is well know that Power BI is about to destroy Reporting Services, but, there are a lot of Companies that can't move to Azure just because of their Reporting Services reports.
Azure may have a solution for that and not only Power BI. Right now reporting services is an instance level feature but it could work just like a huge report container and every single application with the proper configuration and security could access to the reports that you have in there. A place where you can manage all the data sources and reports.