Interesting discussion. From what I just read on the Storming of the Bastille page on Wikipedia there were a lot more foreign regiments that being considered here. According to the Wiki page, "The Swiss and German regiments were among the foreign mercenary troops who made up a significant portion of the pre-revolutionary Royal Army, and were seen as being less likely to be sympathetic to the popular cause than ordinary French soldiers. By early July, approximately half of the 25,000 regular troops in Paris and Versailles were drawn from these foreign regiments."
So clearly mercenary regiments made up a significant section of the army if at least 12,000 troops in Paris and Versailles were foreign. Therefore, the idea of dispersing the mobs with foreign soldiers isn't completely unlikely, especially if they are ordered to garrison the Bastille. Keep the guns and ammo out of the mobs hands, enforce a curfew on the city and arrest a large amount of the various Parisian revolutionaries and you might have a chance of success.
Of course the idea is completely opposed to Louis XVI's personality and mindset at the time, so don't know how likely this is.
So clearly mercenary regiments made up a significant section of the army if at least 12,000 troops in Paris and Versailles were foreign. Therefore, the idea of dispersing the mobs with foreign soldiers isn't completely unlikely, especially if they are ordered to garrison the Bastille. Keep the guns and ammo out of the mobs hands, enforce a curfew on the city and arrest a large amount of the various Parisian revolutionaries and you might have a chance of success.
Of course the idea is completely opposed to Louis XVI's personality and mindset at the time, so don't know how likely this is.