It isn't the Ps3 can go under 100K this week - it's likely to.
Unless Ps3 has a software release this week in Japan (I don't believe it does), it is unlikely to increase in sales (it would rather decrease. It did have a 21% drop last week).
So, it needs an extra 8K in Americas (if Japan remains unchanged, which is optimistic). That's a 25% increase, which is very unlikely.
The same goes for the X360, but to a smaller extent. All it needs is really a +1K in Americas, so it's more of a 50-50 there I'd say.
Edit: Famitsu has the Ps3 at 9K in Japan. That's 4K lower, so a 33% increase in Americas would be required. Very unlikely.
When I write Fact: in one part of the post, and opinion: (or a similar word), it's not because I can then say "my opinion can't be wrong". It is to inform what part is pure facts, and which part I try to draw a conclusion in.
