* The poll should say "2015", not "2014". Sorry!

The Xbox One started out very strongly, but sales have since plummeted and is now trending below the Xbox 360:

This could accelerate in the holiday season, or perhaps it could allow the Xbox One to widen the gap, since the Xbox 360 wasn't selling that well in its first 2 years.

When will their streams cross?

I think that, if the gap hasn't closed by the end of next quarter, which is unlikely because I believe it was a soft quarter for the 360 and Microsoft would have to have the One linked to cancer to underperform against it, the holiday rush will give the Xbox One a boost that will help it widen the gap again. Whether that keeps going after the holidays is another matter, and we might end up seeing the graph going up and down, and up and down over the years.

Also, taking into account the facts that many sales figures publicly known, such as VGChartz, are guesstimations more than anything else, and it would be a cold day in hell before Microsoft ANNOUNCED they'd lost that edge, we'll probably never know for certain if it even happened. =P Depending on how much the console is being overtracked, or undertracked, it could occur and we wouldn't realize it, or never happen but have guesses lead us to thinking it did.

In the coming months it will. It's been losing grounds for a while now..

I say October or November

Some time next year. Certainly not before December.

I believe the Xbox One will continue to under perform until Halo 5 comes out. Any other releases (in my opinion) will just give it a temporary boost where it will then go back to under performing.

it won't I think it will either go up and down all the time or if handled right it will go up this Holiday and keep the momentum.... but I doubt it will go under 360... I even doubt it will keep widening with the PS4 a that rate come next year.... especially the more they listen to Phil Spencer and the customers

how much did the 360 sell in its second holiday?

So many memories of the "Mind the Gap" charts :)

It still should have a decent boost in september when it releases in European Tier 2 countries. so I don't think it will fall behind any time soon