I would say, that is a great idea. But sure it needs someone with coding skills. I have seen one app for the Windows once that lets you manage many cloud solution like OneDrive, Google Drive, Dropbox and many more. Now I dont recall if it was open source or even available for Linux. But if there is one then there may be many other clients like that which are open-source.

It would be really great if someone makes a client where we could access many cloud solutions simultaneously. And almost everybody uses cloud these days.