No. Expectations of one market are not the same as the other. People buying dedicated gaming devices expect a minimal amount of support. Whether that support is supposed to continue or not, constant actual upgrades shatter consumer confidence as they feel support for their device is under endless threat. Also, those specs are atrocious. A Wii U level home console launching in 2017? Better be $99 if you don't want to be laughed out of the industry and even then it would be a joke. You realized by that time, used PS4s and Xbones will be at or bellow that price. Shoot, new ones will be getting close to that price if not being there already. Also, Nintendo making a raw tablet? What would compel them to do that? That market is over saturated; it is a bloodbath for anyone not already established. Sorry, but the whole strategy in the op is full of holes and overall a dreadful plan.

I am against them having the same games on both platforms... They can unify it all they want just as so long as they make the games use the respective platform's advantages (like the consoles' extra horse power) and not have the same games on both devices

But this isn't even about that... Consoles =/= phones... It takes time to make games for consoles so having a yearly release would be a nightmare for the developers as well as many other things... Then again, expecting someone that came up with this horrible idea to understand the implications of this isn't worth it

How would it be a nightmare for developers? That's like saying it's a nightmare to develop for the iPad Air 2 compared to the iPhone 6 or iPad Mini 3.

They are all seperate devices that share a common unified architecture making it extremely easy to port/scale games to one another. That's what this scenario is. 3 different form factors that each get upgraded every 3 years. How is that any different that 3DS/3DS XL getting upgraded to New 3DS/New 3DS XL?

It doesn't matter if the support is planned to be there, constant spec updates give the APEARANCE that support could end at any moment.  Just look at the panic ensuing from the slight implication that the Wii U may possibly perhaps have a lifespan slightly smaller than five years.  Maybe.  Now imagine that kind of confidence erosion every single year.  Appearances matter, a very great deal.

 There were a host of factors surrounding the Wii's success that are no longer present today.  Things change.  HD was not a widespread thing in 2006 and HD development was in its infancy with early efforts not even comparing to later one.  The early fumblings and the ubiquity of standard def televisions helped mitigate the issues of the Wii's performance issues.  But even so, the Wii outperformed the original Xbox in real world performance, so your point is invalid.  It wasn't a giant leap like the 360 and PS3,  but it was a noticeable improvement over the GC.  That combined with early HD development issues and standard ref's widespread use in the early days did a lot to help the Wii avoid too much backlash.  And the Wii caught the attention of a neighboring demographic that is no longer interested at all in dedicated devices. And the Wii brought a reinvention of gameplay that captured imaginations;  that ain't happening in 2017 at $250 most likely.  

Also don't compare your proposal to the Wii.  The Wii was a cut above the original Xbox in real world performance and noticeably better than the GC.  What you are proposing would be like if the Wii was a pinch weaker than the Dreamcast.  The power gap between PS5 your proposed device would be so absurd as to be comical.  

People don't freak out and think games/apps are going to stop coming to iPhone 5, iPad Air, iPad Mini 2 now that iPhone 6, iPad Air 2, iPad Mini 3 are out, so ur just making up an excuse.

Not a single person in the world gave a fuck that Wii was ever so slightly more powerful than Xbox, they bought it because of its games/features not because it was 10% more powerful than a 5 year old console.

Again, I'm not proposing that such a device is going to sell Wii numbers but something like this could be attainable.

Console, 3-5 million/year

Portable, 5-7 million/year

Tablet, 7-8 million/year

Total, 15-20 million/year

Which is similar to 3DS+Wii U annual sales

The two markets are different for goodness sake how can you not see that?  Of course no one gives a **** about game support on their phone or tablet, those are not dedicated gaming devices.  They're phones and tablets.  The games are a fringe benefit.  When someone spends over $200 on a dedicated gaming device, their expectations are different.  Games are THEcore function, without them the device is useless.  They aren't a fringe benefit, they're everything.  So the constant implication that your device may at any moment lose support erodes confidence.  The markets are different.  Consumer expectations are different.  Also, you are presuming that all the factors I listed did nothing to help the Wii;  that is an extremely bold assumption.