Give the Power BI mobile app (whether iOS or Windows) the ability to render and interact with a workbook offline. This would truly have an impact on the Mobile BI story, otherwise you cannot be truly mobile if an internet connection is a prerequisite. Customers are mentioning that competitor products have this capability in their mobile apps. I would suggest giving a user the ability to enable/disable offline capability for a workbook/report or group of them. Or give the app the ability to download offline copies/snapshots of a workbook in the background based on a custom schedule or existing data refresh config. Obviously certain functions would need to be limited for offline mode, but at least a user would have access to certain data and basic functions without the need for an internet connection when travelling etc.