Seems like you've never interacted with a narcissist to any degree of knowing the person.

Your idea of Trump is that he's going to actually put in effort to achieve whatever high point he's setting up for himself. Trump's idea of Trump is that the world's going to bring it to him, and if it doesn't, it's the world's fault for not living up to his desires.

Despite having mastered the public appearance of sincerely-confident person who always sells the good side of his product, inside, he's still a deeply-wounded and insecure man-child who, like all children, projects his imaginary power over the reality that doesn't give a crap about what he wants.

That he's learned to force himself onto what doesn't bend to his will as an adult - with varying degrees of success, a graph which sadly includes actual successes when people are his targets - doesn't make him more adult or, for that matter, more mature. To hope that he'd do something good with it now that he's 70 is getting your hopes too high: he is, after all, still an asshole.