Actually they did again you are only looking at face value to prove yourself correct. There were thousands of threads when unlimited went away.
2GB for $30 vs. $30 for unlimited. Price went up no matter how you look at it. Price may look the same but by the very same argument used back then. You pay the same for less which is paying more. Similarly to what happened with Netflix when they split their plans in 1/2 and charged the same price for each half. That's 100% increase in cost for the same plan.