Luka, absolutely, can grow up, and I think he probably will.
But I think it's a minor miracle that they've gotten this far. He's, on an individual talent level, a top 5 guy, for sure. But he seems insufferable, not just as a fan, but to his coaches, to his teammates and to the refs... who still seemingly bend over backwards to appease him and he still openly despises them. The Mavs have had a great run, surrounding Luka with a bunch of young hungry players and a castoff star in Kyrie who was mostly unwanted. Which, at this stage, is probably the best type of team to put around him. Kyrie is there because no one else wanted him, they made some truly great moves at the deadline to surround Luka with lengthy, athletic, defensive guys who don't demand the ball. Absolutely the type of guys to pair him with.
But it's a reflection of his weaknesses. He doesn't defend, he's the most ball dominant player... ever.
I do think he can mature out of this. I don't doubt that at some point we will see a season where Luka focuses on his conditioning. Not just coming into camp in shape but maintaining that for a season (he's clearly gassed late in games... and obviously tubby). But his mentality has to change. He needs to play faster and actually give a crap on defense. He also can't have these ego battles in series... it went in his favor against the wolves, ANT went haywire trying to make it a one on one series, but not everyone is that stupid.
He is a really competitive person, and that goes a long way. I expect him to continue to elvove and eliminate his weaknesses... but I'd rather he didn't. I also hope he does so once it is too late and he has continuted to alienated basically every talented teammate he played with.
Kobe was pretty similar... obviously, Kobe actually defended, unlike Luka, but Kobe was a guy who tended to make things about himself and drove away a lot of teammates, but was still an obviously phenominal talent. If not for Phil Jackson, and making things work despite the egos, Kobe's career would be a different story.
If I had to bet... I think that at some point Luka either evolves on his own or a coach comes along who can temper the situation.
But I'd rather it didn't happen.
Side note: If he continues this crap with the refs, he will find himself in Chris Paul territory. A player whom the refs can hardly tollerate, and in certain situations openly antagonize.