As I wasn't born until 76 I don't regard 67-71 as the good old days as I never experienced them, just great moment in citys history, the good old days for me, as you said in the second paragraph is late 80's to mid 90's where even though we were not winning things and were hit n miss, I had great days watching city win or lose, and our kits had navy socks, so am quite fine with us having them again.
Tbh I couldn't give a toss if they are sky blue or navy as long as they ain't white, they are only the socks. the shirt/shorts is the most important thing.
Growing up though me dad n grandad constantly have videoes of city on from pathe news reels of all the cup wins and loses prior to 67 and then the Mercer years and bell, lee, summerbee, young etc, the first city vid I saw was a colour snippet of the 56 cup which is why maroon for me is the only away colour I want to see us in.
the third kit, the sash was cool, but we only had it twice in history, as long as the the shirt is white with either black or navy trim and shorts I am happy, though we have used gold/yellow from time to time.
The double decker kit is pure nike bollocks and this insistance on givin us all navy away or black away kits recently it's shite, maroon or red n black stripe should be our only away choices but preferably maroon.
But everyone has their opinion and they all count, as we have grown up in different eras and different kit styles, which is why city should choose the base template and not deviate.