Nope... Historically Far Cry has always had support for multi-gpu setups. It just goes to show these devs still focus on the PC despite this game being a multi-platform. I'm actually happy to see them listing required specs to hit that magical 4K 60FPS. SLI/Crossfire/Multi-GPU have always been and continue to be a small margin of users. The only difference now is the cost of pairing two mid-range gpu's have increased (Pre-Mining) not favoring them over a single gpu solution at 1080P / 1440P 60hz compared to a few years ago when pairing two cards was a performance value. It's no longer the case today and leaving these extreme SLI/Crossfire to high-tier gpu users at 4K+ resolutions, multi-monitors, and high refresh setups.
Of course, was more referring to the fact that it is such an item for this release, especially since its always been present here. Elsewhere, you see SLI support waning fast. But I get it, some people prefer to pick their games according to what has SLI support and what doesn't
The actual fact is, that it should be supported on ALL games. There was a time when it was available on almost everything, some 4-6 years ago. Now? If its 50%, its a lot. And since Nvidia themselves shut down SLI on anything but the high end GPUs, this market will diminish fast, and along with it, the support in games too. There are mainly two types of SLI / Crossfire consumers: the ones who shoot for dual+top-end GPU right away, like you, and the much larger group of people who add in a mid range card 'later, when they need it'. That second group of consumers is going SLI because of budget and allowing them to chop their GPU price in half with the promise of more performance down the road. And that's the group that is now gone.