Source dashboard reports from SSRS reports.
One of the more powerful features of SSRS is the ability to define expressions and use them virtually anywhere in the report to control a huge range of functionality. Any integration of SSRS with power BI that does not include this would be worthless. I suggest a) start with Power BI being able to use SSRS Datasets as source, b) allowing Power BI Dashboards and Reports to drill down into SSRS (this would require admin function to link onprem SSRS instance to organization in Power BI) and finally c) to bring Power BI together with a new "POWER RS) feature, that is SSRS fully cloud enabled and integrated in the Power BI Portal
