I think with this upcoming generation Nintendo will be ever better with the moves they make on both the 3DS and Super Wii.
Honestly, the Wii and DS were their testbeds for all their ideas they had, and they had decent success with them. Now that they've had 6/5 years to figure out how to make the market respond (and oh did it ever), they've probably got a much better idea of what sells to what crowds, and probably have a better idea on how to handle the pacing of a system that caters to bother the "Casual" and "Hardcore" markets.
I think with their new systems, there will be more constant flow of quality games for both audiences, and that we won't have significant droughts from them like we have in the past.
The 3DS already seems to be doing good in this regard, with all their announced games and all. We'll probably be seeing a quality Nintendo release on them every 2-4 months, and good third-party efforts year round. (also 3rd party multiplats back on a Nintendo home console excite me)