With the right support, Nintendo should be able to keep some decent sales and with some hard work from Nintendo even the second spot in sales.

They can turn it around, but just not at the same level. 1st/2nd party games will be the "savior" of the Wii U, but 3rd party support can lure in the FPS gamers and the Sports game players to a better level. By 3rd Party support, I don't mean bad/missing function ports.

I agree with you, except for the part where wii u has a reasonable price. hell no. The console is too expensive, doesn't worth it, besides the low price was the main reason of the wii's success. 

About the question: probably not, PS3 had and still has good third+first party support, Wii u will get the "big games" this year (except for zelda or SM3DW sequel), and will receive a few games of smaller Nintendo's franchises the next years. I think it can improve, but no near of ps3 level sales.

It is impossible for Wii U to sell as much as the PS3, but it is not impossible for Wii U to end up being profitable for Nintendo, even if not by much. Without third party support and with the casuals gone this console should sell Gamecube numbers + casuals who bought a Wii for motion controls and became Nintendo fans (an unknown number).
N64 numbers would be the roof.

The Wii U architecture isn't worse than the ps3's?

At this point in time I dont see the Wii U pulling a PS3. Nothing is impossible though, so I wont count it as an impossibility, just not likely

It would require Nintendo to lose money hand over fist trying to get people to develop games for the system. That's not Nintendo's way. IMO they should, but won't.

I don't believe that Nintendo are willing to spend their way out of this like Sony did with the PS3 as overall profitability is more of a concern than marketshare. I could see a minor pricedrop/bundle once MK8 is released in order get the ball rolling but investing anything more than that is highly unlikely.

No, Sony put money and real effort into saving the PS3. Nintendo will continue to make games but that's not enough.

Nintendo needs a whole rebrand to save it, I think they will just give it support until they can make a new console.

Do you think if a next pricedrop wouldn't reflect and turn worse Nintendo's actual situation?. They would have to work even harder to turn the console profitable, and as you see, they didn't make 100% well if their last pricecut. I agree taht MK8 bundles would be an explosion of sales.