The Causeway is like the aorta in our blood circulatory system. A block or choking the Causeway/aorta could immobilized the heart and leading to death. Keeping this Causeway open is critical to both countries. But at some point in time, there are factors that would favour one side and gave the idea that keeping it close, choking it, would be a good thing to do. At this point in time, many of the good things are on the side of Singapore, economics, security, social etc, would favour Singapore even if traffic flow at the Causeway is not optimum, or slow. It seems that choking the Causeway is more favourable to Singapore than Malaysia at this point in time.
The Malaysians want to raise Causeway toll fees, why should Singapore allow the Malaysians to profit from higher toll fees and not Singapore. They jump, we jump, they raise, we raise. This seems to be the mantra of the day.
A decade or two forward, when the Iskandar Economic Zone took off with massive Chinese investment and infrastructural development, when Tanjong Pelepas and Pasir Gudang became more efficient, just to service the factories and their goods in Johore, when KL becomes the land transportation hub for rail and roads to China and Europe, when the Isthmus of Kra is cut and ULCC by passed Tuas Port, what would be the effect of choking the Causeway?
What would happen when the faster, cheaper and more efficient HSR takes over as the preferred mode of transportation to Europe and China, replacing the ships and the sea routes? What would happen when goods from Singapore got held up at the Causeway and unable to catch the land road to Europe and China? When the Iskandar becomes a boom town, like Shenzhen to Hongkong, the poultry and farm produce from Malaysia may not find it necessary to travel further south than the IEZ?
When economic activities shifted to Malaysia, like the factories of Europe and America shifted to China, the Causeway could become a lifeline for Singapore to access Malaysia and the land road up north. Choking the Causeway could cause a heart failure and total and permanent disability for the whole body system. Keep the Causeway free flowing then could mean a life and death situation to the Singapore economy. It be would Malaysia's turn to want to choke the Causeway to its advantage.