That's not what Nintendo is saying at all. What they're saying is that there's no reason to sell a new Gameboy at this time with the massive success of the DS. The DS Lite can't even remain in stock over in Japan and isn't even out yet here in the US/Canada. Why start talking about or release a system that could steal the DS's thunder and possibly kill its momentum.
Nintendo simply wants to ride the DS wave for a little while before announcing a new handheld.
Nintendo simply wants to ride the DS wave for a little while before announcing a new handheld.