I feel like the bronze age ended with DD 181
These all coincide with something I feel is very overlooked in terms of comic history, and that's Stan Lee leaving Marvel Comics in 1981 to run the TV/movie studio arm (leaving Jim Shooter in charge of Marvel), along with Jenette Kahn taking over DC the same year, which eventually led to Alan Moore, Neil Gaiman and Vertigo.
Because we now had two totally different people running the two largest comic book publishers, it's no coincidence that things changed at Marvel and DC circa 1981, and fast. Creator royalties, a massive mini-series explosion, more adult themes and stories, etc. Shooter even got rid of the No Prize.
DD 181, in retrospect is a great ending. Notwithstanding JC's added comments.