I've always thought that this might be an interesting scenario. We'd certainly see a very different eighteenth century with this King Louis XV than in OTL.
The Duc de Bourgogne was known to be a very pious man and was greatly influenced by the dévot party at court. Also, if I remember correctly, he and his inner circle were interested in reforms such as less absolution and centralization, more aristocratic involvement in government to the expense of the bourgeoisie, and a great deal of local power in the provinces. So think some of the experiments in the early years of the regency of the Duc d'Orléans, but on a far grander scheme.
A more powerful nobility in France could, IMO, butterfly away the Revolution, or at least delay it, especially if they were no longer centered at Versailles.