What I think Nintendo needs to do with the Wii/DS
1) Online system - Create a 3-layered system (similar in some aspects to xbox live)
A) The "bronze" system uses the current idea friends codes system to keep the strain off the servers while still offering online multiplayer, bare essentials and free access to download or play online-only nintendo games that can't be accessed by non-wii/ds systems.
B) The "silver" would be 1 step up and offer access to online tournaments (bet/entrance fee with wii points!) while limiting those tournaments to online family-based titles (yu-gi-oh, pokemon, maybe batallion wars, etc).
C) The "gold" system would be a fee-based system like Xbox Live and linked directly to your "Mii" that uses a credit card to validate a "high-end" account, one that offers a full online ID system, easier-to-use friends list with instant message system, and complete access to rankings/tournaments for all online games. Make it *optional* to set a small password/login system to prevent other people from using your "Mii" account.
My hands are beginning to hurt already. ;)
2) Spend a bit of their budget for some significant big game names. Here's some "investment ideas"
A) Konami - Hire them for 2 exclusives, a new Zone of the Enders and Suikoden VI (extreme wiimote potential), both exclusive to Wii. Castlevania probably wouldn't go according to the creator's words, so how about a totally new Contra-style IP with 4-player online capability (or 2 per console). Don't forget a Wii version of Winning Eleven that's online! ;)
B) Capcom - new cell-shaded style Megaman Legends for Wii (with same-console or online co-op!) as well as a new side-scrolling Megaman game designed a bit like New Super Mario Brothers, 2d gameplay with 3d characters and stages with a full map system, also utilizing the wiimote for 360 degree aiming. Try to get them to make a "Resident Evil - Pre-Negative" game that goes on during the process of gathering the "ingredients" to make that uber-virus. ;)
C) Atari - Pay some $ to make the DBZ fighting games exclusive to Wii. (no more PS2 releases) ^_^
D) Square-Enix - Kingdom Hearts 3 on Wii exclusive, pay the big $ if necessary. Try to have Square resurrect the Bushido Blade series for Wii as well as Front Mission for Wii. If possible how about a new Final Fantasy Tactics game for Wii, with full orchestra and all? ;) Don't bother them with the regular FF series, but fund it to try to maintain and build-up the FF:CC games into a legitimate spin-off series, hopefully one that appeals more to the old-school FF gamers that don't care too much for the FF-movie style gameplay.
E) Bioware - How about a new Baulder's Gate/Icewind Date-style game with online co-op and downloadable missions. :)
F) Sega - If the new Sonic game is sucessful try to help coax them into making the "secret rings" into a mainstay series on the Wii, also try to hire them to make a new IP fighting game for Wii, the Namco-Sony bonding recently doesn't bode well for a Soul Calibur on Wii, and the Wii definitely needs more than Super Smash Brothers/Bleach/DBZ fighting games for a "darker" variety. Unofficial sequel to Skies of Arcadia with big-fleet battles would be very cool, make it an action RPG with single player story co-op functions sharing controls of the battleship (pilot, gunner, captain) or sharing the battlefield.
G) Ubisoft - Try to make sure Red Steel 2 is tweaked up a bit more and offers full multiplayer options, also try to hire them to make spin-off IP's of both Splinter Cell and a new sub-series of Rainbow Six that are both exclusives.
H) Sid Mejier - Civilization Wii with online, make it so! ;)
I) Sierra - Have'em remake Homeworld (the original) with a full online multiplayer system where players fight over the galaxy in a clan-type setup. (best 3d RTS ever, would work very well with wiimote)
J) EA - Battlefield Cold War, (alternate reality 1970-1980 era) goes a bit worse for the US, rebellions across europe & south america become violent and cause war with communists right after US President successfully assassinated, US off guard driven out of of mainland europe, new Battle for Britan failed, but still try to fight off the communists on Britan soil, they also start invading through Alaska, full single player campaign with coop, massive online system with changing map battle lines per regions with random map generator. Invest in the new sports games to have their own graphics engines that take advantage of the Wii's hardware (no more PS2 engine ports), full online functionality. I dunno what current Wii exclusives EA has in the works other than SSX Blur.
K) I don't recall who does them, but try to re-establish Digimon as a "more mature" Pokemon series, also exclusive to Wii/DS. Series had potential to fit between pokemon and bigger series, but didn't "oomph" enough.
J) Disney - offer them some incentives to make more movie-games "Wii only"
3) ADVERTISE - Make that initial $200 million advertising budget quite a bit bigger, help 3rd parties advertise their nintendo-console games considerably better.
A) Start hitting Cartoon Network/Disney Channel/Nikelodeon and websites occasionally with the commercials for wii/ds exclusive pokemon/yugioh/dragonball/disney games as well as some "middleground" games that appeal to non-casual gaming youths as well as young girls. ;)
B) Start putting ads up on 1up/ign/etc websites for bigger name serious series for wii/ds, try to change game adds every month for newer/alternative titles.
C) Start hitting prime time occasionally with non-casual game adds, like advertising Cooking Mama and the DS Chef Assistant program on food network during some big shows, the sims wii during reality shows, etc.
4) Wii/DS Connectivity
A) Take the connection potential up a notch or 3, allow the DS to be used as a secondary screen to show maps, inventory, and other useful aspects during the gameplay, but nothing that would absolutely require it to play though (none of that Final Fantasy Crystal Chronicles GBA multiplayer crap).
B) Create games that allow the player to play the same game on the Wii or DS, moving your character back and fourth with you when necessary so you can keep playing while at home or on the road. Pokemon and action RPG's would benefit greatly from this. :)
If Nintendo could do a considerable amount of this, which would essentially offer a fairly solid selection to serious gamers while totally dominating the casual and youth markets, Nintendo could completely obliterate the 360/PS3 and blow the lid off of the size of the console market without allowing Sony or Microsoft to barely touch the added gaming population.