Sure seems that way with the announcement yesterday of iCloud Drive, a baked-in DropBox type cloud storage service. Check out the images on Apple’s site:
That sure as heck looks to me like a file system. There seems to be folders tied directly to apps, as well as more generic folders. I wonder if they’ll use Tags to allow a spreadsheet for example to reside in both the Numbers folder as well as your own Household Finance folder.
In general, this looks exactly like how I currently use DropBox. I’ll happily replace it with iCloud Drive if it works as advertised. I have to assume that in terms of overall functionality it’ll be more powerful than Dropbox.