Let's not pretend that sales of DC Comics, or Superman titles, have remained consistent for 4-5 years following the 52 reboot. There's been highs and lows, and a pattern of sales declining that would be viewed as quite negative to not only DC, but probably the brass above even them. If the idea was to just let business go as usual UNTIL the sales get to that 2010 level, obviously that's not a plan anyone in their right business mind would be too keen on.
Superman, in particular, not only received alot of attention from the comic book readership thanks to being one of DC's big guns for the 52 reboot (which of course got alot of advertising), but also has very much remained in the public consciousness thanks to MOS, Injustice, and more recently BvS, along with the association of Supergirl on CBS. If anything, and if we were to compare the final 5 years of 'SuperDad' 2007-2011 to the New52 run (2011-current), the latter has had much more cross promotion than the Post-Crisis/Pre-Flashpoint Superman ever enjoyed. Which was in 2007, the already-in-progress Smallville show on CW, and Superman Returns the previous year (which was 2006, but let's be generous and count it). Depending on one's view, the SR could be viewed as either a positive or negative...
But ... hey. Atleast Superman comic sales are still above those 2010 numbers, right!?!
Yeah, I think DC and WB are painfully aware the entire line needed a change. We can argue/debate whether the change is too drastic, or sit and complain because someone's feelings got hurt due to DC deciding on the switch, but a serious shakeup, was most assuredly required. Just as it was in 2011. Though the Superman line desperately needs a steady and clear vision in direction. Which wasn't something the New52 run got.