I'd just think if you had such a quantum techno-lust increase to covet a six-core processor when you'd recently invested in a 4-core Sky or Kaby, you would be willing to shell out for the mobo and appropriate chipset as well. Otherwise, how much extra processing power would you buy, and how much of it would you or your software use?
By the time I want to play catch-up with a newer Intel generation, the chipset, BIOS and board revision will be mature, and I'll only need to do it just for fun. I'm having a lot of fun as it is with my Skylake processor. And it is considerably more than strict need for new tech in my usage profile.