The year is 2030, a small startup company has developed a universal game engine perfect for any type of game and capable to run on any kind of hardware and OS. Stupid CEOs have all jumped on the idea to sell all of their games on every platform to make even more money, completely forgetting how useful exclusives can be to sell hardware. So now people got used to playing any game wherever and companies trying to re-introduce content exclusivity in any form are successfully boycotted out of existence.

- To make things simpler, we will only use Playstation, Xbox, Nintendo, PC and mobile as platforms.

- Exclusive software and hardware features as well as subscriptions are allowed. That includes peripherals that may enhance gameplay.

- Due to the nature of hardware and software restrictions not all games will have the same fidelity on each device but they all have the exact same gameplay and content.

- Crossbuy does not exist, people forgot to protest for that. However cross-progress does exist so people will be able to play on the same account on each device. They will have to buy the games separately on each platform, though.

- Exclusives up to 2020 releases are allowed to stay exclusive to the respective platform(but don't have to). Successors to said games will not be exclusives.

Ok, I hope I didn't forget any stipulations. So now the big question is: 

Which platform will reign supreme in sales? Which will go out of business? Which new platforms may arise? Will the whole gaming industry crash? What will the new console wars will be about?

_{PC and mobile will only count if bought with regular gaming in mind.}

One important note: A company may still have the most revenue and profits even if they do not have the highest hardware sales if they create popular games.

In that case, I think people would be fine just buying "generic game console" or like "Samsung box" ... like do you care what brand your cable box is? You just care that it gets all the TV channels you want.

If every game would come to any platform without any kind of exclusivity, there would be dozens upon dozens of different brandless gaming consoles. So trying to see which of the big three would sell more would be moot. PC would still be the leading platform, though.

Voted for Xbox but the true is whatever who sells consoles for the lowest price and had the more consumer friendly approach

Probably go PC then?

Because of gamepass service and controller, i pick Xbox

This one's easy. Nintendo exits the hardware business as smartphones and set top boxes quickly make their consoles obsolete. MS and Sony sales plummet from where they are now. They're left fighting for scraps in a vastly more competitive market. MS takes a commanding lead over PlayStation in the US thanks to better services and more aggressive marketing. Sony continues to win in Europe. They're all dead in Japan.

Sony's online store brings in decent revenue for them, but ultimately M$ becomes the overall most profitable of the current Trinity... Next to Nintendo, whose software sales have shot through the stratosphere due to there mass appeal combined with being available on every device known to man.

Writing and testing a game that would run on that number of platforms would be a pain. Also as the hardware manufacturers are big advertisers and marketers of games for their systems, this would make it difficult for smaller publishers to function.

I suspect that such a world would look a lot like the Google Play store. 99.999% in-app purchase shovel-ware, with no one able to justify developing anything more advanced than Bejewelled.

Simple really, if every single game made is "multi-plat", then platforms no longer exist. And everything is inherently an "open-platform".

We will see, "gaming consoles" or "gaming PCs" from everyone. They will be as common as there are laptops and phones or even android TV boxes.

But in this case... doesn' whichever company that owns that engine own the game industry? Surely, they will take some royalties for every game made using their engine, even if its 3% of the game sales. While such a thing kills off platforms on the hardware side of things, it would have in turn created a monopoly on the software side of things.

That is way too much power to put in the hands of one company.

Exclusives are a by-product of platforms existing, and platforms are necessary fr the industry to grow and it keeps everyone honest. I could never support a system that puts this much power into the hands of one company.