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MacBooks _will_ transition to Apple's own chips at some point. My guess is that the A14 or A15 generation will be fast and powerful enough to make the leap. This will be big especially if they can get major price or power usage advantages.
Arguably they are already powerful enough to make the leap in at least some cases, that said Apple does not push Macs in the same quantities as iOS devices as to justify wholly new silicon for the line. I have been in an argument with a friend for the past year or so about precisely when (or if) Apple will rip Intel out and use their own silicon. I think they will, but I'm going to try to present his argument to the…
Apple certainly markets their iPads as a competitor to the MacBook, so maybe they’re not looking to use custom silicon in the Macs but simply to phase out desktop computers when iOS and third party applications are ready to replace PCs for the most part.