Jerry Rice was a great receiver but look at what else he had on the field with him in the days of the 49ers. He had about 2 other receivers able to get open. Cruz had a down year and could have had more yards and tds if Nicks was healthy. Look at the game against the Bucs. Yet if the Giants are unable to take care of the other receivers, Cruz is going to do little way less if he gets a good paycheck if the Giants are unable to replace the other receivers.
If he leaves for more money and the Giants don't have enough to keep him, then Cruz is about money more than the team. That may not be a bad thing and that is what he wanted if he does leave.