I never felt that “I’ve always known I’ll die alone” was any sort of precognition, or meant to be. It was just a nagging, irrational fear/expectation, of a sort I think many of us have. Plus, it was obviously a setup for him not dying at the end of The Final Frontier, when he thinks the Bird of Prey is about to kill him, only for him to be beamed up and helped instead.
And intentionally or not, Generations seems to make a point of disproving it, in accordance with its own themes: At first, Kirk appears to have died alone, in the fiery blowout on the Enterprise-B (cf. “Time is the fire in which we burn”). But later, when he does die, it’s in Picard’s company, no longer alone (“Time is a friend that sees us through”).
And intentionally or not, Generations seems to make a point of disproving it, in accordance with its own themes: At first, Kirk appears to have died alone, in the fiery blowout on the Enterprise-B (cf. “Time is the fire in which we burn”). But later, when he does die, it’s in Picard’s company, no longer alone (“Time is a friend that sees us through”).