The article says "Under the U.S. Constitution, a state can only impair an existing contract if the impairment is reasonable and necessary to serve an important government purpose.". I hope you can see how broad and left to interpretation this is. In the worst case, state can modify its constitution and compell to disolve this specific contract. Courts only exist to protect the constitution and they need to follow the law created by legislature. Courts are not there to create new laws.
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