I understand you're being facetious, but regardless of the name, the movie was a box office success, and the movie would still be as terrible if it had any other name. The name has nothing to do with 'success'.
We will only know in retrospect, after the series is over, if the creators decide to spill the beans on what they planned from the beginning.Personally i think its dumb to do that, the show is Mando/Djin, the story of a space gunslinger, Grogu is his sidekick that was supossed to be a small gimick that would go away at season 2, i bet they got pressured to keep him because he sells well
I think the show will lost people interest if they change that, the story about the space gunslinger, this is what hook people, the different premise from other star wars stuff that disney destroyed.
Even if the show is retroactively naming Grogu, nothing about the show has to change. It would still be a space-western following the adventures of Din Djarin. The only point I'm making is that Grogu might be the show's namesake. He was the macguffin of the first two seasons of the show; and we will see whether he continues to be in this season. Like how the title of 'The Lord of the Rings' has nothing to do with referring to the main characters; it's referring to the big bad of the series, Sauron.
I don't think they'll change pace on the show if it retroactively is about Grogu. He's already been a focus of the show, and the lynchpin to Din's sacrifices and character growth throughout the series.
- - - Updated - - -
Maybe he'll force-wield it like Alucard's sword in Castlevania.