It was the same with Romo. He had to grow up too. When he was younger he claimed that if the worse thing that happened to you was that you lost a game then you have a pretty good life. That was pretty nonchalant, to say the least. In professional sports winning is everything.
I think what changed Romo was the 2010 season when he first got hurt for most of a season.
He discovered, or you might say he woke up to the fact, that his career was finite. It was going to end and that end was getting closer. He understood that there was going to be a window after which there would be an end to football forever.
I believe Zeke came to that realization as well. His future is now.