>Would someone spend $1k for one lens for their $500 D3200 >class camera? >Esp if in a year or two the lens will be useless?
The lenses will not become useless...they will still take the same great photographs on any one of the millions of DX bodies in existence. They won't magically stop working the day Nikon discontinues the last DX body
There are many big name pros who have a D7000 simply for the DX factor when shooting long lenses. DX is not dead, I'm certain the end is looming but I'm also certain there is room for one more "pro" DX body.