Were the problems faced by Louis XVI in 1789 insoluble or were simply mishandled?

If Louis XVI had allowed the Third Estate members to join the convened Estates-General Meeting on June 20, 1789 (preventing the Tennis Court Oath) and conceded a number of their requests, it would have been possible for the monarchy, the nobility, and the clergy to survive in a weaker form without a full-on revolution. However, Louis XVI would have faced strong opposition from the nobility in France to make the concessions and, because of his lack of charisma, may have had immense difficulties in leading France down a more liberal path.