Lol. It's cute that you actually think that the number of people who will quit or decide not to play because of allied race requirements are an even noticeable amount. By not removing the requirement Blizzard is ensuring that people have another thing to spend time doing, and thus another reason to stay subbed, while also retaining the value of a system that rewards continuing to play.
MMOs are time-consuming by design. Stop asking for fundamental MMO gameplay elements to be removed because you lack a decent attention span or the motivation to get rewards by doing the things that unlock those rewards. Go play fornite, that's probably more your speed.