Hardcore fans are going to see TROS either way. Mandalorian will have nothing to do with it.
I don’t understand the idea that’s constant floated around here that people will only see the new Disney Star Wars thing if they liked the last one, these are separate projects and audiences are generally smart enough to understand that. Anyway, if the reception of a previous project will determine the success of the next, by that metric shouldn’t Mandalorian be in potential jeopardy because of Solo and TLJ? No. The truth is Mandalorian will do big numbers, but they will obviously nothing compared to TROS, and neither will have much to do with the other.
If anything Mandalorian is a risk for TROS’s potential. We’ve never had live action Star Wars on the small screen, and Mandalorian looks to be feature film quality. If audiences see that they can just get Star Wars in the comfort of their living room, they might be less incentivized to go out for it. But again, that’s not hardcore fans, who will show up either way.