Making choice between a new Cube vs new app to implement new business processes

Summary: We are facing situation where the current app size is big and we are going to implement further processes to support forecasting and these new processes will have almost same amount of data that we already have in the application. To implement these new processes we are battling between idea of using separate cubes vs new app to support the processes. Below are few of the points that have collated, due you think there are other consideration to keep in mind while deciding between cube vs the app.

Please note we have enabled module based application and enabled Financials only.