2014 also killed the MCU vs. DCEU battle before it even started.
GOTG, Antman, and The Winter Soldier came out, and it put the MCU into different genre's. DC could never make those types of movies.
Civil War was the nail in the coffin and basically. The knock out punch. The whatever you want to call it. And they haven't recovered ever since.
Since MOS came out DC has dropped 9 movies (10 if you included the Snyder Cut)
Marvel has dropped 14 movies.
The best chance at a rebound is/was the Snyder cut and timeline continuation and they're dead set on scrapping it.
Karma would be Cavil and Synder finding work at Marvel and doing some ill shyt.