Just because what the WWE superstars say in their promos is scripted (at least somewhat), that doesn't make it all untrue. And actually, according to the Wrestling Observer Radio's Dave Meltzer, "usually when those words are used on television and promos, it's because somebody thinks that."
Meltzer was specifically referencing Miz's promo last Monday night on RAW when he called out Dean Ambrose for being lazy and complacent. And according to Meltzer, "It sounds like somebody feels like Dean is too complacent right now, so it sucks for him."
Which, would explain why his Intercontinental Championship match against Baron Corbin at this year's WrestleMania was relegated to the pre-show!