It's Star Wars, this will never not be a thing
I think it would be a false impression that Temiri BLagg will even matter in this movie. I mean, how far would Disney go with a child in a movie that is literally centered on war? Anakin did little more than race and fly a spaceship, and Blagg is a slave with little skills we know of besides custodian work and animal raising. I agree a lot with @jayzor17 about this, he existed to take care of some goat giraffes and to show that there is always hope, even if Rey dies.
I think there are a lot more people who liked TLJ than we know. It's really only the loudest fans who absolutely hate at least parts of it that we can hear. No one remembers flawed movies for the good parts, or at least Last Jedi. Same with the prequels. I, for one, fully like and appreciate all 11 Star Wars movies, and I am all the happier for it. I like some more than others, and will debate commonly, but I stand by my position on the matter. I highly doubt IX can break this.
I think that this goes to show the brilliance of TLJ. Whether or not the movie is bad is your own opinion, but if Johnsen was able to present what he had to show in a way that convinced people it was good... that's genius. The "tarnishing" of one's high opinion of movies is a huge problem I have. I hate letting others tell me what's good and bad in a movie, probably why I have so many unpopular views. Sometimes I'll admit someone's right, and sometimes I'll say whatever I can to protect my own view of the movie. This is also a reason I can't stand many "How It Should Have Ended" videos. I will never watch the "reviews" of Venom or Infinity War, because I hold those movies high enough (the former more ironically) that I can't hear anything that could possibly ruin my experience of them. I continuously debate Hyperspace ramming and Sling Ring severing to keep this.
Wow, text blocks are fun.
I just hope IX will be "good enough" for more people than just me. I'll wait for the trailers to get excited, but I'm ready to see how this galaxy of stories may close.