We've had a data warehouse for a number of years which includes a sales data cube for reporting. This solutions served a few SSRS reports but never saw any self-service action in it's entire lifetime. We've recently had our eyes open to the wealth of BI capable tools centered around Excel and now PowerBI. Our SSAS solution rarely changed as we don't have in-house talent for SSIS and MDX tools.
Using Excel and Power BI has made us amazingly productive developing BI reports that are blazingly fast. We find ourselves reaching around the data cube solution and grabbing data from raw SQL tables and feel pretty good about the results.
At what point or for what reason would we spend the money to continually enhance our SSAS solution as we find additional data needs or is Power BI a good final solution or modeling tool on the way there?
Any and all thoughts appreciated.