For some reason, I don't believe that Ubisoft will wait 5-6 years.
P.S. In general, balancing takes a lot of time, as it is one of the most important criteria for a strategy game, but it is quite rare to achieve a perfect balance initially; patches, etc., are still necessary.
Bow down and hear our cry,
Our earthly rulers falter,
Our people drift and die,
The walls of gold entomb us,
The swords of scorn divide,
Take not thy thunder from us,
Take away our pride.
G.K. Chesterton: English Hymnal