User blog comment:Slate Vesper/Assassinews 15-06-'13 — Three Assassin's Creeds in development and Patrice Désilets' lawsuit with Ubisoft/@comment-5019018-20130624152832/@comment-1153722-20130624154712

Prior to the release of Assassin's Creed III, they said that they would like to reach at least Assassin's Creed X. So expect about four or six more at least.

Also, low sales figures are what it would take.