This is just like a lottery bet though, only bet what you can afford to lose, just to have some excitement while watching, I think that would help.
So, they need to beat 4 better teams and that doesn't happen, you might get lucky with one, you might just pull it off with the second one but not 4 teams on 7 game series. Most likely outcome right now is either first round exit or a second round exit, that's it. However in few years I do see them becoming contenders, just like how Giannis took Bucks to a whole new level, I am sure Luka will too.
Nothing is impossible though the chance is small, we are not just talking about Luka here but the entire Dallas Mavericks roster, they are all capable of winning and they are hungry that's why you can bet on them.