Eiji Aonuma, the producer of The Legend of Zelda, recently talked about the possibility on making a Hyrule Warriors saga. It looks like it will depend on creative components and certain circumstances to work out. Currently, there are no plans for making it into a saga.
In an interview with IGN Aonuma said:
"I do think circumstances could align like this again, but I don't think we're expecting this to become a series. We'd make that decision based on its creative merits, just like we did this time.
Echoing my answer to the question above, we're always looking for valuable creative projects, but those only come about when several different conditions align. So, I think it's hard for us to have conscious control over the frequency."