That's the most interesting to me. The revenue breakdown shows that not only is handheld revenue way down from it's peak, it has yet to start growing again. This is the point where DS really exploded, I just don't see 3DS making the same jump. It will track in between GBA and PSP for the foreseeable future now rather than with DS.
The chart also shows just how heavily the Wii expanded Nintendo's audience (and revenues) from a low of just $79m in a single quarter with GCN, they peaked at over $1bn in a single quarter with Wii. We could be heading for an era where Nintendo bring in the same amount of money they did with GCN/GBA but without the GCN hardware profit margins.
But at that point the DS had software which people wanted to play - we are just heading into that range now - that is to say the quantity of software which makes someone switch from won't to maybe to buy.
I honestly expect the similar sales for the 720/PS4 as the WiiU - the software that has been announced and so much is cross generational why would people want to sacrifice their digital libraries for a new console - doesn't make sense.