It takes a simple majority in a referendum to change the constitution? Chilling.
No, what's chilling is that they let people vote on it in the first place. I say that if you're going to let people vote on it, then it should only require a majority. This is common, by the way, in the western states. Texas, for example, has around 400 amendments to its constitution.
Of course, the better way do it is via representative democracy. And I think that's more common back east. What's the point of paying a legislature if you're going to end up putting everything out there as a binding resolution for the great unwashed masses?
The problem occurs when the leadership of the state realizes that letting constitutional questions out for a vote only weakens their control. If their is no mechanism for direct public amendments, then power can be skillfully consolidated. IL is an excellent example of this, where there are clear court issues pointing out problems in the constitution, but no questions to the voters in the last 10 years.