WW "goes insane" in 15th issue

I just don't see what the point is of a story like this:

Wonder Woman #15 marks the beginning of a new story arc, "The Truth." When Wonder Woman first left her home island of Themyscira, the condition was she would not be able to return. Despite this, she did promise her mother she would. It had seemed as if she did find a way.

Wonder Woman has discovered all the times she's been home over the years, she's never actually been there. It's all been a lie. This knowledge and the possible implications over what her recent visits to the island mean and where she actually might have been has shattered her mind. As seen in the preview above, she's been taken to a hospital to be cared for her while she remains in this state.

If this goes more than 2 issues, that'll surely be its biggest weakness, but not the only one. And, it'll just demonstrate further how "Rebirth" isn't leading anywhere. But as the product of an overrated writer like Greg Rucka, it'll be no surprise. Such ideas are no substitute for character drama. It's not all that different from the time when Brian Azzarello changed WW's origin so that Zeus was her father, for no good reason.