Greinke's contract has nothing to do with it. You think the contract Price signed wasn't enough to convince you? You think contracts from last year didn't tell you teams can't keep an entire rotation with that level of talent together?
Come on. Everyone knew this. Enjoy it while you have it. Besides, there's a better than even chance at least one of them will develop arm trouble. The future is rarely as good as you think it will be. Which is why no team, no matter how much money it has, in 2015 and beyond can afford to neglect it minor-league system.