There's no question for those who understand the stats that Trout was clearly the more valuable player. However, historically that isn't how the MVP has been decided. So there is a case for selecting Cabrera.
Let's face it, a lot of these awards are popularity contests and rewards for years of accomplishment rather than just the past season.
Look at gold gloves. Derek Jeter? Give me a break. Great hitter, mediocre shortstop wins the gold glove because he's a great player and playing in New York.
In the end, no big deal. If Trout continues in this vein he'll win a handful of MVPs.
As far as the "don't change their plans" bit you might want to check with AL managers about that. My guess is that he affected every one of their "plans" much like Rickey Henderson used to. You can't pitch around speed.