To be honest, Naruto has a number of options for dealing with the susanoo. The susanoo is the ultimate jutsu of the sharingans. While a complete body susanoo is extremely robust, it is not indestructible. It can be destroyed if attacked with a powerful enough physical or energy-based attack. If one were to defeat every single one of the sharingans in battle, then the susanoo would be no obstacle. However, it is not impossible to destroy the susanoo. A genin who obtains the assistance of a kage bakenezumi can destroy a complete body susanoo using their chakra. This shows that even a ninja without any special abilities can destroy a full-body susanoo if they work together with another skilled ninja. Now, this does not mean that the susanoo cannot be defended against. A wise commander will never put his/her troops in a position where they are vulnerable to attack. By doing so, they risk losing the battle before it has even begun. This is why techniques such as self-defense techniques and evasion tactics are important when fighting against the susanoo. A skilled commander will use these tools to keep their troops safe while at the same time putting them in a position where they can fight back. In conclusion, yes the susanoo can be destroyed but only with a lot of effort.