Here is a good article on nine things the Wii 2 needs to be successful:
http://mediarushes.com/2011/05/04/nine-things-nintendo-needs-to-do-with-wii-2/
It's funny, even though Nintendo has continually made a profit off of every system they've made (sans the VB), we don't really consider many of them to be successful. I think we all hark back to the SNES days and recall how great everything was. The Golden Age in Gaming. That was when Nintendo was really successful. As a result, we try to build similarities and correlations as proof of what Nintendo needs to do to repeat that golden age, but I do not think we understand the underlying reason for that success in the first place. It was successful because it was exactly what people AND developers wanted. It was a rare time, where both type of consumers came together. It flourished both in sales and support, and Nintendo was making hand over fist from both sides of the equation. The only time this has happened again was during the PS2 era (another era we draw proofs).
So naturally, anytime we talk about Nintendo success, we talk about third parties, we talk about support. But third parties are only half the equation - the half we can't do anything about. So all the talk about new systems and wishful thinking boils down to what can Nintendo do to attract more third parties. It's like a magical solution that once that is resolved, we will again experience an SNES-like golden age of games. But if that truly was all they needed to do, then Nintendo would have became Apple a long time ago; with dirt cheap development costs, virtual market support, and instant sales data and gains. That is not Nintendo.
Nintendo is different. Out of every system maker, they do not have an ulterior motive. They don't want to take over your living room. They don't want to be your central media hub. They didn't even want you to play DVD's. All they want is for you to play games everyday. That philosophy isn't going to change. Everything else is an after thought.
So in keeping with Nintendo's philosophy, how do you build a system that both people and developers will enjoy?
The two are almost always at odds with each other and I don't think building a more powerful 360 with a dash of Nintendo, as that article implies, will do it.