For reference, other leading systems in history...
DS
9 over 4 million
8 over 5 million
4 over 10 million
1 over 15 million
PS2
22 over 4 million
13 over 5 million
4 over 10 million
PS
22 over 4 million
14 over 5 million
1 over 10 million
GB/GBC
12 over 4 and 5 million
6 over 10 million
4 over 15 million
3 over 20 million
2 over 30 million
GBA
7 over 4 and 5 million
2 over 10 million
1 over 15 million
SNES
9 over 4 million
6 over 5 million
2 over 10 million
1 over 20 million
NES
10 over 4 million
6 over 5 million
3 over 15 million
2 over 25 million
1 over 40 million
"[Our former customers] are unable to find software which they WANT to play."
"The way to solve this problem lies in how to communicate what kind of games [they CAN play]."
Satoru Iwata, Nintendo President. Only slightly paraphrased.
