The unibody MBP came out in 2008, but the retina generation came out in 2012. I'm not sure how you wouldn't consider that a redesign. It got thinner and lighter, added retina screens, changed ports (added HDMI and TB, lost ethernet and Firewire), lost the optical drive, changed HDD to SSD, etc. When the MBP is redesigned again, changes overall probably won't be as drastic as the ones that came with the retina redesign.
Yes it's slimmer and lacked an optical drive, but it essentially looks the same. We've had port changes year to year, but don't consider that a redesign. The retina generation is akin to an automotive mid-model re-fresh...or a iPhone 6 to 6S.
I'm talking a full re-think of the MBP. While I don't suspect Apple will ever have a detachable screen, or a touch enabled screen, I'd like to see more than just making it thinner.
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