But IMHO it's more likely than not that there will be Skylake Macs significantly before mid-2016. Like I said: If you can wait. Any time is good for a Mac if you need one.
Early 2016 would be the soonest we will see any Skylake-based MacBooks. Sure, if you don't need a new Mac this year - go ahead and wait. That same rule applies to any new generation / upgrade / refresh.
There is nothing special or unique about Skylake that makes it a "must", not any more so than any other iteration of Intel CPUs.