GenerationofSwine
First off, it was doomed to failure from the start. Training Day wasn't a good movie, it didn't have a good plot, it didn't have a good story. What it had was Denzel Washington giving one of the best performances in recent memory. He did an epic job, and it's that work that made people like the movie.
People didn't watch Training Day because it was good, they watched it because Denzel was great. And Training Day without Denzel... sucks. No one is going to be interested in it, because it was a "meh" at best, with a performance from ONE man that people still talk about.
Give it another 20 years, people will probably still be talking about Denzel's performance in Training Day.
Let's be honest, they don't watch it for Ethan Hawke....