So I finally got this completed. I got the idea from old Gamasutra NPD sales reviews, so thanks for the idea:
As you can see the industry has been in a retail sales decline since 2008 at 21.4 billion dollars. However, this year will be the first year of retail sales-growth rather than decline. So far the year is up 9%. If that trend continues, it will end around a projected 14 billion in total as seen below:
I think September-December will be up more than 9%. Nintendo is offering better selling software in Q4 and third parties beginning September are offering software that should sell on par or better overall than last year. I'm uncertain about Microsoft's and Sony's software offerings this holiday. And I wonder if the the PS4 can increase enough this November and December to replace a possible decline in XB1 hardware sales compared to the 2013 season.
It is important to note that this is only NPD reported retail revenue and excludes digital purchases.