Kishi may end the manga but that doesn't mean the anime has to die Like in DBZ, it was supposed to end with the Cell Saga, but they created the Buu saga and even DBGT. The same can be done with Naruto.
In this life I know there will always be people trying to make money, and if they can, then they will. It is very possible that the anime will continue, of course this is all just speculation.
Another example: Halo 3. it was supposed to be the last in the series, the creators claimed they weren't going to continue for a Halo 4 but they would make other games in the Halo universe like Halo Wars which they did. My friends gave me so much crap about believing there would be a Halo 4, my key argument was that if there is money to be made, then someone will do it. And look what happened, Halo 4 came out and they are making Halo 5 and claim to have a Halo 6 as well, there's a Halo 5 trailer out if anyone's interested.