2p system doesn't take more maintenance than single cpu system these days. I have 2 dual xeons systems, with identical parts as my i7 workstations, except for motheboard and cpus obviously. Same memory, same ssd, same coolers, but that's beside the point.
Same maintenance (none).
The comparison of 5960X to 2p system was that it's almost getting to that sort of performance in single box, with still fraction of price compared to 2p system bringing it to affordable level for people who crave maximum performance in single box.
Of course you can buy 1.5 PCs worth with 5820K, you can also buy 2-3 PCs worth with 4770k, or 5 PCs of i5..or..always find the best value/performance. Except for that isn't the sole factor of choice for everyone. If it was, no one would be buying BMW car if they get almost the same (70perc.) performance for only half the price (Opel,Citroen,whatever there is) and buy two of them, one for wife or sister too. Performance/Value is only single metric, to some the most important, to some completely irrelevant.
Single, powerful workstation will still be valuable to lot of people, either enthusiasts or professionals. And now they can get it "cheap".
5820k is crazy deal from intel (finally), and great choice if you want to build semi-budget renderfarm (because the value/performance will be still better outside of LG2011 platform) or workstation. But that doesn't make it some sort of winner over 5960X. It's different CPU, for different people.