I think these numbers show two things:
first, that the sales in the first four months of a consoles lifecycle don't decide the console war. (this one was obvious)
but second, and this is more interesting, that consoles with a head start often start slow and win the race at the end anyway, while consoles with a late launch need great numbers to come close. (In my opinion, N64 managed to come close in NA, but it was the only one with a late launch that had a chance).
this would lead me to the conclusion that x360 will be hard to beat and that only wii has a chance, while ps3 already lost. but this would ignore the fact that we are just talking about NA-Numbers.