Most likely, they will, but not soon because:
They need to make the system first. They are still making DS/DSi games.
Yes, there is currently a new Mario Kart in the works for Nintendo's new hand held system: the Nintendo 3DS.
it is a new system by Nintendo
probably
yes
You can't downgrade your Nintendo DS system.
The Nintendo Entertainment System on Amazon from Nintendo is $280 for new, and at least $68 for used.
there might be around 2010 possibly
No.
yes nintendo is always coming up with new systems. the new systems are dsi xl and 3ds
possibly if Nintendo comes out with a new system
3Ds or something like that.
Nintendo discontinued the 64 system August 20, 2002.