He had a great role in "Wall Street: Money Never Sleeps" that went through the entire movie -- he probably thought at the time 'I'm 94, this is a nice way to go out' -- and it was.
Excellent article from Variety, thank you for linking it above -- one of the comments made beneath the article by the readers were also memorable, including this one by one of the readers, Leonard Bloom:
"Many years ago, during a performance at Long Wharf Theater in New Haven, CT, I noticed that my wife and I were seated next to Eli Wallach, Anne Jackson, Paul Newman and Joanne Woodward. At intermission, I gazed down at Mr. Wallach and then asked him the following question: “Didn’t you die in the film “The God, the Bad and the Ugly?” Wallach had a smile on his face after hearing my query and then retorted: “Clint (Eastwood) saved me.” I shall forever remember that evening meeting all 4 distinguished actors and particularly Mr. Wallach’s brief comment to my question. What a man and he’s from Broolyn where I also was born"