I agree with Wright's general statement (that the Wii is in fact a more advanced system than the other two because it opens the experience of gaming to the entire world, really, as opposed to just a hardcore niche), but I don't agree with his final assessment. The 360 and PS3 are most certainly "next-gen" systems, allowing us to play new and exciting games in new and exciting ways. They just aren't widening the scope quite as much as Nintendo is.
Which is certainly not to say that Wii games are better (because with a few major first-party exceptions, they're largely not), but you have to put yourself in the shoes of a 4-year old or a senior citizen or a soccer mom. We take for granted our knowledge and love of games, but the sheer complexity of many of our favorite titles tends to scare off all but the most dedicated of gamers (i.e. everyone on this forum). With the Wii, this mysterious "gaming" thing that all them kids are doing is finally being unraveled. It's the first step towards taking the lid off of video gaming and letting the world at large actually begin to understand it and accept it.
And in the beginning, yes, it will suck. Tons of casual games, tons of shovelware. But soon, and largely thanks to the Wii, more and more people are going to start to allow their hobby to grow more complex. They're going to begin to understand gaming as we do, and the positive payoff will be massive. Generational and cultural gaps will close. Entire families will play together. Gaming will be recognized as a wide, mainstream activity and art form, not just a diversion of the nerd-folk. It'll be kind of like South Korea, but much less creepy.
Of course, the Wii is just a games console with fancy controls, not a miracle worker. But it's an important first step into genuinely getting everyone into the game that Sony and Microsoft just haven't taken.