I think it will be called the US2, playing on the current name but adding an extra incentive for Americans to buy the system.

 Super NES looked a lot different to the NES.

We've all had time to get used to the name and now most people would agree that it's a lot better than REVOLUTION but do you remember the original outcry. A Google search will find tons but I thought this was a good example.

Kotaku  May 6, 206

Even Game Devs Hate Wii
At a certain point, we're just going to have to accept it and get on with our lives, but we're still aghast at Wii. The Revolution changing its name to Wii is like George Gordon Byron denouncing Lord Byron as his slave name, changing his name to "Tinkerbell"... then misspelling it. 

Making us feel slightly better in our seething contempt, we're not the only ones who hate it. Gamasutra interviewed six devs, asking them what they thought of Revolution. Surprise, surprise... across the board, they hate it too. Here's a winning quote from Meelad Sadat, director of business relations, High Moon Studios: "It's telling when a product name needs a 150-word explanation." 

Quoth Ernest Adams, game design lecturer and columnist: "It doesn't change my personal opinions of the console in the slightest. It changes my opinion of the Nintendo marketing department considerably. Did they even bother to research this? Why do they do these things? What was wrong with "Revolution"? It's bad enough that the Japanese have a drink called "Sweat," but at least they don't try to export it to the English-speaking world with that name." 

And David Sirlin, designer, Backbone Entertainment, dismisses it thusly: "Even though Wii meets many of the criteria Nintendo should be going for, it fails at the criteria "don't pick a silly, awful-sounding name." 

Just change the name back already, Nintendo!

NüWii

- Pronounced "New Wii" or "Newy"

This is the best name that Nintendo can use, in terms of still being easy to pronounce and giving a fairly whimsical feel, in terms of NOT using the stupid idea like "Wii2" or "Wii HD", and in terms of having the name represent, both through letters and visual appearance, what Nintendo's Philosophy is :

Wii = We, representing gamers together, the 2 i's look like people playing next to each other
N = Nintendo, representing how much closer this system will bring you to the console they made and being immersed in the games you play on it.
ü = You, representing the focus on the individual player's ability to interface with the game, using controls that can be simple or advanced depending on what best suits the individual player. Having the 2 dots above the u also acts to create the image of 2 players being connected by a line, which shows Nintendo's efforts of improving player's ability to connect online as well as irl.

And just cause RockOn's idea down below is really cool: N.ü.W.i.i. = Nintendo's Ultimate Wireless Interactive Interface

I thought Wii was an acronym. Wii = Wireless interactive interface.

I hope not, it's a terrible name.

Nintendo changes their names depending on the console.

It's not an acronym.

It's just a creative liberty spelling of "we".   The inclusive double "i" gives the appearance of 2 people together as a visual allusion of "we".

I thought this was asking what we called our Wiis.

I think I named mine Colin.

Nintendo has never been the type to slap on a number to their consoles.

 Nintendo Entertainment System

Super Nintendo Entertainment System

Nintendo 64

GameCube

Wii

 Gameboy

Gameboy Color

Virtual Boy

Game Boy Advance

DS

Ironic how it seems that their most successful systems tend to have 3 letters or less. =)