Short answer is a big NO.
The reason is DX lenses on FX camera may give you a worse picture quality than DX Lenese on DX Camera.
This is purely based on my camera. I used to have Nikon D70 with 18-200mm. When I D600 was released, I tried to find recommendations on if we can use DX lense on FX camera. I did not find my answer apparently and went ahead and bought the Nikon D600. After using it with my 18-200 DX lense for a few months and tried all kind of tricks, I couldn't get sharp images. The pictures seemed worse than when I had the lens on the D70. I contacted Nikon and sent them sample photos of from both cameras using the same lens. They told me it was normal. I was shocked but soon realized that I probably should upgrade my lens as well. So I bought the 28-300mm (FX). I can tell you that the image quality is much better than the 18-200mm (DX).
So if you're not sure if you want to upgrade to FX body, ask yourself this question.
Do I also want to upgrade my DX lenses as well.
If the answer is no, I would strongly recommnended you to stay with DX body.
Hope this is helpful.
-->
