I think you're making way too much of this.
The title is acquired in the traditional way within the Japanese aikido community in order to respect the traditions and all of the instructors that have been allowed to use the title over the years. This tradition within Japan doesn't cause damage to the international aikido community. The only exception I can think of is if there were a non-Japanese 6 dan who wanted the title but didn't get it, but I would question that person's motives and also question how they got into that situation in the first place.
The tone of this post debate sounds a little bit like, "It's not fair that they have something and we don't!". I would like to point out that the international aikido community and the Japanese aikido community are not in competition with each other.
I can think of a number of examples of 6th and 7th dans outside of Japan who wanted the title (god knows why) but weren't given it.
"It's not fair that they have something and we don't!"
That's exactly it, why support an organization that doesn't treat you equitably?