Since announcing Final Fantasy Versus XIII, Nomura and Square have developed and released:

Kingdom Hearts II Final Mix+
The World Ends With You
Dissidia
Kingdom Hearts 358/2 Days
Final Fantasy VII: Crisis Core
Final Fantasy XIII
Kingdom Hearts Birth by Sleep
Kingdom Hearts Birth by Sleep Final Mix
Dissidia 012
Final Fantasy XIII-2
Kingdom Hearts 3d: Dream Drop Distance

Was it really necessary for him to work on these eleven games (eight of which on handhelds) at the expense of giving us one original Final Fantasy title?

Then again, this is Kotaku, and it's guaranteed anything they write about Square, PlayStation, Japan, Final Fantasy, or Sony is filled with hatred and jealousy. Just look at what their own editors are posting in the comments.