Why not if the said SoC or some OEM's drop-in replacement still would be available?
Assuming it was available, the price should also be pretty low, and since the chip architecture would be have been well tested and familiar then further silicon editions would surely be more optimized and be less-power hungry.
Also there'd be good time to hone and fix open source drivers.

Actually now as I come to think about it, there are nothing but good reasons to use an old SoC.