It's good news for PC and PS4 gamers, but definitely not the Xbox brand - exclusives can make or break the system, and this goes beyond the scope of first-party titles. If there were no exclusive console titles gamers would have no reason to own any particular console to begin with - whether that's a good thing or not is up to the individual to decide. I too believe that exclusives add artificial value to the console they're on, but I acknowledge their importance nonetheless - exclusive content often times sells the system it's on.
Third Party exclusives are irrelevant and often just build resentment of a brand. Not a great way to get people to cross over. Because that's the point, isn't it? To get people who are enjoying those games to suddenly lose it and cross platforms because it has suddenly become an exclusive. The only problem is, of course, that doesn't work.
Third party exclusives were originally made because of genuine hardware differences or from funding the project from start to finish. Squaresoft was exclusive because SNES did things better than the Genesis, at least the things that Squaresoft cared about. They ditched Nintendo because Nintendo refused to provide the tech they deemed necessary for their future games. Sony provided that tech and Sega, again, did not (3D capabilities were tacked on to the Saturn, Sega was betting on refined 2D for some reason, and were a major pain to implement). Thus, Sony became a temporary "exclusive" platform. It worked out well for both parties but again the hardware was genuinely different.
Fast forward to Squaresoft to Square-Enix transition and exclusives slowly break down as contracts for said exclusions break down, or rather the no compete clauses because lets remember Final Fantasy did make it to PC but it wasn't technically a competing platform so they got away with it.
All of the sudden Final Fantasy is on Gamecube (but not main entries due to financial reasons, they had already focused on PS2 due to previous contract, and also said contract restricted main entries still) and slowly about in the middle of that generation we get broad spectrum third party support, even on the gamecube. Architectures were still different across the board so companies largely stayed with what they felt comfortable with but eventually titles would cross over, like GTA, for instance. Sony actually tried to make a big stink about Square-Enix not re-securing contracts for exclusivity but they pulled back the rhetoric when they realized they'd be stupid to continue it, ala Nintendo lesson.
Then the PS3/360 saga happens. Third party exclusives become even more rare and largely exist at first because of Sony's insistence of the idiotic Cell architecture for gaming. BUT the graphics side of things remain largely the same. So what happens? Studios largely develop for the 360's common architecture first and Sony gets sloppy seconds. Once studios could make that transition more easily it becomes even more apparent and less sloppy. And third party exclusives become largely irrelevant and a money pit. Acquiring studios for exclusives proves largely useless as Microsoft and Rare showed brilliantly. The studio gets the short end of the stick and Microsoft loses money so future projects are in doubt. A terrible relationship. Studios wise up and we see only TIMED exclusives. Because, that ALMOST matters. Makes the platform feel superior but doesn't piss off fans enough to reject your reality and substitute their own. People get money, platforms see slight bumps in sales.
It's suicide to deal in exclusives when you have two platforms that are virtually identical. Yeah, yeah, there are significant differences from a programming standpoint but never before have two console platforms been so damn similar. This will be a timed exclusive. And it may very well be one of the last few. Because even timed exclusives are proving detrimental. People will just wait for the GOTY if you're going to make them wait in the first place. Or they'll wait for a massive discount which is now also available on console platforms just as easily as it is on PC.