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I would imagine the i7-5820K would last more than 2 years unless the current pace of core count increases continues and games readily use 10-12 cores by then. Who knows how fast that kind of change will happen on the software side.
Also, how long a setup "lasts" depends on the person. I still don't have a reason to upgrade my ancient rig so I know in your position I'd go for the i7-5820K option you had. Others might not.
Fair point. It's solely reliant on Adobe, in my scenario. My rig has struggled to keep up with the recent few Adobe update cycles. That, accompanied with heavy use of artboard based layouts and massive file sizes, and the system is struggling.
I'm not so fussed about games, to be honest. I run a 1440p 60hz IPS screen, so high FPS isn't a massive concern. If I do have a game which struggles, I'll happily sacrifice graphic quality.