Yes, to clarify, if the MBA isn’t killed off, there is no decent reason not to launch new MBAs soon with Kabylake, except for the MBP dilemma.
For the MBP, they would have to
a) wait for mobile quad core kabylake to be released next year
b) just whack dual core Kaby lake in and make the MBP a competitor to ultrabooks like the XPS and Spectre instead of updating the MBA
c) put quad core Skykake in the MBP with an extra chipset to drive TB3 in all ports and release now.
I pick c. The extra chipset will enable as many ports as is reasonable to go TB3/USB-C. Apparently the dual core kabylake can only handle two TB3 ports.
There are also a few other options for even more speculative fun
d) Intel make an extra special mobile quad core kabylake just for Apple with unique Apple requirements, which is basically between five and ten percent of its i series chip production
e) Apple produce a Mac variant of its A series chip in the MBA, or alternatively, it’s own version of an x86 chip specifically for the Mac and OSX without all the legacy cludge Intel needs to have in its wider market products.