The rMBP is already impossible to repair, being a monolithic lump of glue and soldering, and because it cannot properly dissipate its heat, it is not lasting longer than its Applecare. I'd rather see a thicker laptop that lasts, including the decent service apparatus that Apple used to be years ago...
Even my early-2011 17", with moderate-to-high use, lasted just about outside it's Applecare.
This has been true for a while, Macs don't last like they used to. I had a G5 that lasted 7 years with HEAVY use before I sold it and a 17" PowerBook that lasted 5 years before it was sold too, both in full working order.
I've gone through 3 27" iMacs , 3 MBPs (all sizes), between 2009 and 2014.
A simple search will show that it is a trend, as I discovered when researching my latest MBP troubles.