i think if they made it were you play on a classic server and it was a flat server and it would only be a small size like not were you can only build one really small thing but like were you could start out with a fresh new flat grass map that would be like 100 blocks each half or less and you could have up to 3 save files i think it would work!!!!

here are my ideas on the commands!!!!
A button: place block
B button: destroy block
Y button: chat bar
X button: block menu
START: to goto the main menu
SELECT: to select a save file and you can also use the stick thingy
D-PAD: to move around
STICK THINGY: to look around
LEFT BUTTON: to move left in the small inventory
RIGHT BUTTON: to move right directon in the miney inventory


it would totaly work and useing some of the money from the pc version to pay for the ds/dsi version
also after if he would make the ds one he sould have twice as much money
but i hope notch reads this and considers making minecraft for the ds/dsi XD