I think clubhead droop has greatly been decreased (not eliminated in total) but reading mfg's info on shafts, new technology and of course the force behind the swing will in fact minimize it from I have read.
Even if that is not completely true, clubhead droop on an iron for example would have to move the sweetspot more than 1.5 inches to get it inline with the shaft, changing the longitudial center line of gravity. That is a lot of stress on a shaft and would greatly call into question the torquing experienced which would impact clubface alignment.
I think the correct answer is NO. Clubhead droop doesn't do it.
Martee, I can take a normal grip of my GW, put the head under a big table and easily make it bend the needed 1.5". So, the needed forces are small.
Somebody posted a good pic about droop in rec-golf long time a go - you could clearly see how sweetspot and handle are aligned, thanks to droop. Could probably google it up, if you want.
Seem it was just some fog about diffrent plane lines, after all - thanks, Yoda.