Following NBC's The Voice does wonders for a show's ratings. Unfortunately, every show can't follow The Voice, every episode, forever.
Last season, Smash followed The Voice, and did fine by NBC standards. This season, when it didn't air after The Voice, its ratings collapsed, and it was moved to Saturday to burn off its remaining episodes before cancellation.
This season, Revolution has followed The Voice on Monday for every single one of its episodes, and has done well by NBC standards.
However, its week to week ratings trend looks ominously like Smash's first season.
Wait until next season, indeed.