It's $15 a day: $300 if you commute 20 days a month. That's not a small price change.
I find that tolls are a good idea, but suspect that we'd have significant complaints situation if the MTA decided to raise the prices of the 30 day pass by, say $300 a month in one sitting. People made decisions based on existing prices, and a change this big. Going around the price changes by moving or parking further out and then paying for a train is a significant lifestyle change. People get really mad when rent goes up by this much too. So all in all, we don't need any car dependence exceptionalism to expect a lot of push back.