The argument the video makes is far too reductive and simplistic to be valid though. I'm genuinely surprised people are willing to accept that the video game industry has evolved like it has "because marketing". Is marketing a factor? Sure, probably quite a big one. Companies go where the money is. But to ignore the enormous social, political and economic factors at play at the same time is doing the industry of the era a disservice.
The evolution of any industry is complex, and gaming as an industry still has a lot of growing up to do. If we in 2015 want to facilitate changes for the better, we would be wise not to condense 30+ years of history into a "because marketing" meme.
I like thinking about it in terms of evolution. Evolution happens in fits and starts. It hits dead ends, and now and then takes a leap forward when a particularly beneficial trait becomes prevalent. It's a slow process, and what's built up historically does not suddenly become redundant just because a positive evolutionary change has occurred. The point being, we all (most of us) want gaming to change, to become more inclusive, more varied, for there to be something for everyone - but that need not be at the expense of that which has come before. There is still plenty of room in such a brave new world for more dudebro shooters or sports games, and just because we want there to be other games beyond that scope, does not mean the "ancestral" games don't still have their place. I like killing stuff fatally to death in games. I also want my kids to enjoy Minecraft and whatever else comes along in future.
I think a lot of wasted effort is placed into the perception that gaming, or gamers, are a finite resource that need to be fought over. The reality is that there is a market for anyone nowadays, and if there isn't there's probably an indie somewhere working to create it. We live in the most exciting time in gaming's short history, with more variety now than there has ever been. I love looking back seeing how far things have progressed in my lifetime, and I refuse to accept we are worse off in any way today than we were back then. Even with all the marketing bullshit we have to endure.