Yes & no, as consecutive failure of the Logic Board due to the dGPU can result in a new rMBP being offered to the customer, however this does appear to be somewhat discretionary.
Apple has rather made habit of pushing the thermals on the 15" nor are their actions benevolent, rather more damage imitation. Until people stop purchasing Apple will very likely continue on the same path, carefully cultivating their image versus reality. Simple answer is if you are concerned with longevity don't but a portable Mac with dGPU as chances are issue will develop in time, nor will Apple rush to the rescue unless compelled to by court action...
Apple`s primary interest is great margin`s everything is driven by this, a point worth considering...
Q-6