Or looking at it another way. The Wii and PS3 are stealing some of the marketshare the 360 had of the next generation seeing as the 360 had 100% before the launch of the Wii and PS3. 
I agree with what NJ5 has to say, but, there is no way that we can gauge this average and marketshare this early on in the next generation.
I reckon by the end of next year, we should be able to see how all three consoles are doing marketshare-wise.
2008 is the make or break years for all consoles IMHO. Although the Wii is gaining momentum at the moment and the PS3 is by far at the back of the class. 2008 should be the defining year for 1st, 2nd and 3rd places. Now, I;m not stating that if the Wii is first, 360 2nd and PS3 is 3rd, that this is the way it is going to go...what I am stating is that if the PS3 can crawl up from 17% marketshare to a more reasonable level - 25-30% and the 360 drops from the current 40% to closer to 30%, then this will be an indication of what will happen.
On the other hand, we could end up seeing the PS3 with 20%, the 360 with 30% and the Wii with 50%...who knows.
Prediction (June 12th 2017)
Permanent pricedrop for both PS4 Slim and PS4 Pro in October.
PS4 Slim $249 (October 2017)
PS4 Pro $349 (October 2017)







