Did you actually read my post? Because I gave a specific instance where a system's January was not much lower than the previous November in the US, at least according to VGChartz numbers - PS3, November 2007 and January 2008.

Even if we go with NPD, which had November higher and January lower, the change was only -43%. Meaning, still in the same ballpark.

Besides which, the fact that it hasn't happened before isn't strong evidence that it won't happen now, since there is no precedent for the pattern that the Wii U is following (and no, the Dreamcast is not a precedent, for many reasons).

And if you had bothered to read, you'd see that every console is selling more than it was a month ago; however, no other console is up even 300%, while the Wii U is up 500%. The gain in momentum is seen by comparing it with other consoles.

You want me to demonstrate it another way? In years 2007-2010, the only consoles that came close to this increase in sales were the DS a couple of times, and the Wii in 2010. Remember, this isn't about absolute momentum, but change in momentum. The Wii was struggling through the latter part of 2010, but had a strong Christmas. Indeed, in 2010, the Wii sold better in the corresponding week (week ending 12th of December) than it did in 2009, in the US. In October 2010, the Wii sold just 280k (compared with 630k in 2009)... in November, it sold 1.12 million, compared to 1.2 million in 2009. This was a change in momentum between October and November of that year.

By the way, another noteworthy observation is that New Super Mario Bros Wii released in mid-November 2009 in the US, yet the year-on-year for that month was a decrease of about 31%. But in December, the year-on-year was an increase of more than 40%. The idea that a system-seller should dramatically increase system sales in the month it releases simply doesn't hold water, when you consider the impact NSMB Wii had on Wii sales. (If we use NPD rather than VGChartz, we get a year-on-year decrease for November 2009 of a little over 38%, and then a year-on-year increase for December 2009 of 77%, making it an even more extreme effect).

A typical increase from end-of-October to six weeks later appears to be somewhere around 200-250%. Wii U saw an increase of 498%. That you would dismiss this dramatic difference as "I guess all of the consoles are gaining momentum" is quite clearly an attempt to dismiss a solid argument, rather than addressing it. Why is the Wii U seeing such a large increase? Because of an increase in momentum.

466K to 269k is not close, it's also an anomoly.

WiiU is up so much because had a very small baseline to start with, this is sales 101. Look at how 360 went up 3750% in Japan one week, omgz the momentums! The whole reasoning is sloppy and weak, nothing suggests WiiU will be up in January in the US or WW. The console is having a terrible holiday in terms of sales and demand/hype is lower now than it was this time last year.

I do find it ironic how you call his arguments sloppy and weak when your arguments are the definition of sloppy and weak. X event won't happen because it never happened in the past is a very poor argument. 

So lets assume it will because, you know, why not? Hey why not assume WiiU will have a record breaking January and be its highest month ever, hasn't happened and there is no logic in it but who cares!

Also: As for the rest of your post, it's the holidays. Even Vita is 'gaining momentum' by your standards. What do you expect WiiU to do be doing, selling the same as it was in June??

He clearly proved you wrong by showing you that wiiU was gaining a lot more momentum in the last 2-3months then the vita. In fact, wiiU has been increasing in sales constantly on a weekly basis in the last 2months 1/2 (Except the week after BF). His arguments are definetly valid and far from weak.

No he didn't. I already explained why WiiU is getting a higher percentage boost (which means absoloutely nothing) when the sheer numbers are so low.

There is nothing to suggest WiiU will be up YoY in January, and nowhere near to the point of what he's expecting. WiiU is doing poorly, it's not having a resurgance, January sales will reflect that just like they did last year. Need I remind you, 57k in the US last year. It's going to deviate far from that either way.

No he didn't. I already explained why WiiU is getting a higher percentage boost (which means absoloutely nothing) when the sheer numbers are so low.

Both systems had very similar baselines (vita/wiiU). One took off (relatively) and the other one didn't. So if wiiU wen't from a similar (or even lower) baseline then the vita to almost doubling vita weekly sales. What is that called if it's not momentum. Also, since vita had a similar baseline as the wiiU, why didn't it get the same (or a similar) average boost every week?

As for you're second point, wiiU is following an unprecedented sales patern. We really don't know what will happen in January, but his prediction is certainly not an impossibility.