There is zero fucking chance they just end the Mando storyline and switch to Boba. That would be incredibly dumb, Grogu or no Grogu.
Plus they ended it with Mando having the Darksaber, and really hammered home the point that Bo Kataan has to win it in order to claim it (even though she had previously took it as a gift from Sabine in cartoons). Not only that but they obviously have more planned for Gideon. There is just too much meat on that bone to stop eating so to speak, you got Mando with Darksaber, basically back at square 1 with no ship, no Grogu and probably still has a massive bounty on his head. Gideon is still out there like I said, then Bo Kataan and her quest to get Darksaber, Luke and Grogu, I mean you cant just end it on that finale. Fans would be immensely disappointed, no matter how many other shows they put out.
If they do have the Book of Boba Fett as the 3rd Mandalorian season, Mando would have to be heavily featured a long with Fett. But then Fennec was with him? Wasnt she getting her own show? Its confusing.