I can't believe I am saying this, but...just get a gaming PC if exclusivity bothers you. Problem solved.
But anyways. I don't mind exclusivity as much as I used to, because Microsoft is dead in the water with the Xbone and I'm happy enough owning both Nintendo and Sony consoles, so honestly it doesn't affect me. I used to agonise over which console to get because they all had such good exclusives that I wanted to try, but I was short on funds back then and there was more competition back in those days....it wasn't just Sony vs Nintendo, anyway.
As cool as it would be to have everything on a single platform, I suppose having games exclusive to specific platforms helps promote competition to an extent - I don't care what Nintendo say, they are in direct competitionby virtue of being in the same industry, and that is that; if they think otherwise they're delusional - and really, there's significantly less profit in it.
Take out exclusivity and I guarantee that the industry would get worse, because to make up the money that they'd lose out on by not selling systems, Sony, Microsoft, and Nintendo would all resort to microtransactions, and DLC, moreso than they do now. You'd be looking at paywalls far worse than the Pokeball Plus in all probability.
Consoles make money, and games sell consoles. If the games weren't exclusive to that platform then they'd sell less, the company makes less money, so the company resorts to other tactics to make more money, tactics which probably would not be in the best interest of the consumer. They rarely are, after all.
Exclusivity annoys the hell out of me when the games are part of a series that are spread out across multiple systems though, especially when they're story-focused titles. I'm looking at you, Kingdom Hearts. Prior to the collections on the PS4 - which, by the way, are sub-par considering a few of the games are lazy cutscene movies/visual novels and not actual games like they were on their original platform - this series was absolutely awful for it, with games being spread out across...what, five different platforms? GBA, PSP, DS, 3DS, PS2. Yeah. Stuff like this irritates my immensely because it makes it impossible to get a complete experience. Mass Effect had a similar problem for the longest time because Microsoft kept a death grip on the first game.
But the exclusivity problem is very quickly being eliminated by the rise of PC gaming, to the point that it's only first-party exclusives that remain, and those are system sellers, so that makes sense. There are far larger problems with the gaming industry that need to be resolved than this...