It is neat to have an after story arc. I mean, it is uncommon, but not unheard of. I'm honestly all for it, especially since it's confirmed a mini-series and won't spiral off into a huge thing.
JJBA is a fairly popular series that has done similar to this; where the next season/arc is a generation or two down the line of the previous. Except this time it will be a mini-series, so don't expect too much out of this new Naruto; just enough to make you happy I suppose.
I'll be one to say this... Naruto isn't a terrible series, but at the same time can't be considered amazing. It's above average and enjoyable for what it is (Okay maybe except for the ungodly amount of wasteful, money-grabbing exposition in the animation). Having an after-story is basically a fanfic gone canon and I can guarantee this is what people want.
