A few things.
1. Arkham Knight runs great with at least 12 GB of RAM. Blame the port all you want, but people with at least 12 GB of RAM simply don't have as many issues. And saying it's a bad port doesn't negate the RAM requirement.
2. I mentioned more games, as did other posters. You only used one (poorly) and pretended all the others didn't exist in your counter. Ignoring them doesn't make them not exist, and it makes your argument weaker.
3. Citing "thousands" of OLDER games doesn't negate what I said about the RAM requirements moving forward.
4. Logic dictates that an absolute statement only requires one exception to be shown false. Maybe if people learned to present arguments properly, we could all move on to the real discussion at hand. The person I replied to TWICE insisted on using absolutes. Simply put, they are not right, and Arkham Knight is the most visible example, currently. I can almost guarantee that BF1 will gladly take all the RAM you can give it, and that it will perform better if you have more than 8 GB.
5. DX12 is what the Xbox One uses. It's already taking off very quickly. I don't know what rock you're hiding in.
I used a perfect example of why it isn't as important as some want to make it sound for most people. I'm guessing the CIV games can use quite a bit of RAM too, and if you decide you want to play those, then yea, you should probably get more RAM. Opinions about the quality of the 2-3 games mentioned aside, the OP can make their own opinion if they want to play said games now or not and purchase RAM based on that. 2 or 3 (and yes, it is really just a handful at best) does not make it a must have scenario). I'd be more inclined to say get more if you were doing video/photo/audio/3D work.
Logic dictates that unless you actually HAVE to play those said 2-3 games right now, then there is no need to upgrade said system RAM as it won't actually do much in the grand scheme of things, but let's not pretend the world will fall apart if you don't do it anyway.
As for your comment about old games....you are completely ignoring the 100;s of NEW games weekly that don't require anything near 8GB, even the higher tier games. Again many of you are spitting over a handful of games period. Even in 1 year, 8GB will be fine for 99% of the use cases, if not longer.
DX12 as a whole is being pushed by MS and MS alone for the most part, but as has already been shown, many of the DX12 games were already being developed for DX11. Sure, there will be more DX12 games, but I won't be in any hurry to play them due to the fiasco involved in doing it. (Different topic, no need for you to go on a tirade about how wonderful Windows 10 is). The point is millions agree and for the time being it will force the hands of devs if they want to make any money. This also has already been shown with at least 1 DX12 game already - granted may have more to do with UWP vs Steam.
Anyway, it's all opinion if you want it or not, but people have been towing that same line for 5 years about how you need 16GB to game...and it simply isn't true, yet.
Given OP's config, which is more or less identical to mine, I stand by not needing it at this time.