[quotemsg=17757013,0,570460]It simply makes no sense to me right now to build a brand new computer today centered around a CPU that's almost four years old.[/quotemsg]
Firstly, excellent point about gaming being a small factor. If you run applications that demand CPU power, those older AMD CPUs are a poor choice. Also, good point about Vishera being very outdated and outclassed. Scratch vishera from my previous post - it's not competitive today.
For Kaveri though, there is a scenario where it'd make sense. The 860K is $70, which is about $50 cheaper than an i3. Take someone who (at home) games and does light productivity work involving web browsing and office applications. Any heavier work is handled by remoting into a work machine instead of bringing gigabytes of data home every day. Then the performance impact is small because web activity is bottlenecked by network performance and office applications remain very responsive on weaker CPUs. At the same time, practically all modern games will be playable with a good graphics card.
As for future-proofing, it's impossible to see the future of course. But historically, games have increased demands on GPU power far more than CPU power, and CPUs have aged very well. An i7 920 from 2008 will still push playable framerates for almost all of today's games when paired with a modern midrange video card. A 9800 GTX from 2008 will struggle on games today even with settings turned down. In addition 512 MB of onboard memory is limiting (causing stuttering), and DX 11 support is missing.
So for future proofing with respect to gaming, I think it's better to put $50 into a better graphics card, perhaps with more video memory. Outside of gaming, a larger SSD ($50 can take you from 240 GB to 480 GB) or more RAM ($50 is more than enough to go from 8 GB to 16 GB) also feels more solid for future proofing.