Bush said:
Analog was a new way to control
... in 1972.
Well, actually 1968?
So what's gimmicky about motion?
The way it's unnecessarily shoehorned into games it has no reason to be in except that people expect it in every title because motion controls were the Wii's
main only selling point until Mario / Zelda / Mario Party / Mario Kart / Super Smash Bros / Pokemon N+1 was released.
The next Nintendo console will more than likely not deviate from their standard modus operandi. Baby steps into the future with some shiny gimmick to get kids excited, wrapped up in a cute little package with a tech demo pack-in and eventually a library full of slightly upgraded versions of the last console's first party staples. It's a very lucrative business model with minimal risk and investment, and the fans eat it up. Why should they deviate?
As for the next gen coneole, it's probably just going to be a Wii with full HD and probably 3D support. It will more than likely play Wii games (possibly dropping Gamecube disc support to cheapen and simplify the disc loading mechanism), but instead of playing backwards-compatible titles in proper HD like the Dolphin emulator can it will just upsample 480p. There will be a Virtual Console, avatars, friend codes (cheaper than a single sign on XBL/Steam model), and a gimmicky tech demo pack-in to show off the new shiny (like Wii Sports Resort was). 802.11n, Bluetooth, maybe gigabit Ethernet, and possibly a Blu-Ray disc drive if the drives are cheap enough and they need the extra space when the time comes. (But of course if it gets a Blu-Ray drive it won't play Blu-Ray movies, because that would mean licensing codecs and that costs money. Same deal with streaming services like Netflix and Amazon VOD.) There may be games that can play on the Wii but will take advantage of the new thing's enhanced capabilities (sort of like the black Game Boy cartridges) to bridge the gap between the two systems.
TLDR take the Xbox 360 and remove Xbox Live, DVD playback, Windows Media Extender, Kinect, and all network services besides multiplayer, throw a couple Wiimotes at it, maybe bump the clock speeds a little, give each player a separate number for a name, and you've got my theory as to what the next Wii will be like.