Yes it would be lame, but it would be easy to do for Blizzard since they already have all the assets/skins for it.
Personally I hope that Night Elfs get an nature ally, like... Ardenweald Satyrs but with Night Elf upper body (sort of a bipedial Azeroth Dryard). But currently we have no base for that at all, we only know that Elune has plans for the Night Elf souls in Ardenweald and that Tyrande gets some thing from the Winter Queen. But nothing has been datamined in regard of a new allied Race.