The people you mention did great work, no doubt. But you run the same risk of minimizing the Miller effect as you accuse me of by ignoring everything up to Miller. It wasn't an incremental step or another chapter: it was cataclysmic. The biggest reboot in comics history probably. Sorry, but Batman was languishing before DKR.
Consider this: check Overstreet under "Batman" and its related titles. You may find "Batman Family" and one or two others prior to DKR, and THEN count all the titles and mini-series and one-shots, and Killing Jokes and Shadows of the Bat and Legends of the Dark Knight, and on and on, and then tell me how I'm understating how inexorably Batman's current popularity still owes to The Dark Knight Returns! The avalanche of titles is mind-boggling and relentless, and DK gave birth to that. It is not only the spark, it's the powder keg, too.
p.s. And it's with a partially heavy heart, mind you, that I advocate forcefully this view. I loved the DKR in a vacuum, more as one in DC's never-ending sea of hypotheticals, but I don't like how gritty comics became throughout the 80's and onward, and DK was a big part of that.