What are you putting on a tablet that fills up 128GB of space?
Of the machines I own, internal storage is just cache. I have a 9TB zfs NAS for stuff I actually care about. Whether an iPad has 16GB or 128GB of storage doesn't really matter; they are both equally inadequate. There would need to be two orders of magnitude increase to fit all my stuff in.
My iTunes folder is currently at 60+ GB, and that's after purging all the TV shows off of it.