The seeds of a cataclysmic revolution were sown FAR earlier than under the reign of the hapless 'Louis le Bon' and his unfortunate wife.
The refusal of his Grandfather Louis xv to address the inequalties of Taxation, opportunity and representation throughout the system, 'Apres-moi le deluge', being [essentially] his attitude, made it inevitable. Time and time again he put off opportunities for meaningful change.
Louis xvi had relatively little time to make any change [15 years], and did so ONLY when the state had been brought to Bankruptcy by the STUPID attempt to wreak revenge on the English [the hereditary enemy] by financing [at VAST, unaffordable cost] the rebellion in America.
This 'pay back' for the French defeat in the 'Seven years War' cost France VERY dear indeed.