Der Dativ ist dem Genitiv sein Tod is an interesting German phrase which originates this question. I’m interested in knowing how true is it/will it be.
Has German always had four cases? Or were some cases deleted/added? When?
I'm temporarily a DaF-student, and while learning the genitive repositions, there are some that are dative prepositions as well (e.g. wegen, dank, ...). However, my teacher ‒ who is young enough ‒ told me that her grammar courses at school classified those prepositions as exclusively genitive. If this change took place so quickly, could people predict a year in which the genitive will be obsolete?
Could the “elegant” feature of the genitive, later on sound just old-fashioned? Am I using old-fashioned grammar when talking between “Kumpels” and using genitive?