@Ail
Your mistake is thinking it has to outsell them every week to make any progress towards 50%. PS3/360 combined can outsell Wii every week for the rest of the year and the Wii can still gain marketshare.
If PS3/360 account for 51% of consoles sold from now on then the Wii won't be outselling them combined. However with it selling 49% of consoles every week it's LTD marketshare will continue to rise till it hits 49% at which point it will level out. Only at that point is it necessary for the Wii to outsell them combined to get over 50%.
Let me put this into simpler numbers:
Wii has sold 26 units so far.
360 has sold 19 units so far.
PS3 has sold 13 units so far.
Wii has 44.8% of the marketshare with those numbers. If for the next 40 weeks Wii sells 9 units every week and PS360 combined sell 10 units we end up with:
Wii with 386 units
PS360 with 432 units
At that point Wii has gone up to 47.2% marketshare. So even with the Wii being outsold by PS360 combined sales for 40 weeks, merely staying close enough gives it a major boost.
