Power BI Dataset Design App
In the future there should be a dedicated app for designing datasets exclusive of Power BI Desktop. Power BI Desktop's existing modeling capabilities should be retained but all of this modeling functionality and future modeling investments should go to the new app. (This is similar to what happened with Power BI add-ins for Excel).
The new dataset design app would be capable of targeting Azure Analysis Services servers and would contain the very best modeling features from existing designer experiences as well as application lifecycle management (ALM).
The app would enable/disable features based on the target server (PBI or AS? Premium or Shared?) and would expose a new data science and advanced analytics features. Self-Service BI datasets and small scale datasets could still optionally use Power BI Desktop but BI teams and larger scenarios would quickly adopt the new, single BI Semantic modeling tool for Power BI and Analysis Services.