The games setting sales records aren't even on PC. Money talks. Billion dollar releases on consoles vs what? You think angry birds makes that kind of profit?
You are living in the past, and yes. They aren't making a billion dollars if they are spending 500million to make it. Angry Birds by comparison wipes the floor with AAA returns. (PS not even sure where you got the billion dollar release, but if you are talking about COD, that was proven to be false).
What BD is saying is not at all out of the question in the next few years. I admit, I am not exactly excited by that change, but on the plus side, the PC is actually a VERY good candidate, however I think mobile is where everything is going to go. Why spend 500 million for 5-6 million customers when you can spend less than a million and make much much more.
The problem is companies are greedy and want to control everything. Is there truly a reason to have a Xbox One vs a PS4 when 95% of the games are exactly the same across them and PC (and figure that the money you save on buying them on PC will outweigh any overage costs for a PC). Most companies don't want to tie themselves to one platform anymore because 5-6 million sales is no longer considered successful (and I have to laugh at that).
In the Nintendo/Sega era, multiplatform games actually had completely different dev teams and outcomes. There was a reason to be biased. That hasn't been the case in awhile and has come to a complete waste of time with this gen. it is as outdated a mindset as the 2 party system.
In the end, the argument remains to be seen. People keep citing record breaking numbers, however that is like 1 game a year out of how many AAA titles alone. Most of them come up in the red (according to the publishers). Either someone is lying their ass off, or people aren't buying most games at launch or at full price. As I repeatedly say, the crowd here is skewed considerably and are not the 'norm'.