Stats on the es_es and es_ar language pack: Downloads in last 60 days
es_es 2.3: 4,482
es_ar 2.3: 808
To compare: Dutch 2.3: 817, French 2.3: 3642, Mexican 2.3: 3639
So I think the stats descide here: no, we are not going to delete those langage packs. Someone to help improving them (if necessary) is welcome .