Pointing out the landmine in his career path was my most rewarding moment as a teacher in the last two years. I'm relieved that he won't waste seven years getting a Ph.D. like I did.
Doing what you love helps with success, but it's not a panacea - you're still subject to the same constraints as everybody else.
Besides, I don't know what things are like in your neck of the woods, but around here, I don't know too many starving PhDs.
Hollywood is still largely an exploitative, winner-take-all system but there are some built-in protections in the system to make it more sustainable. Academia seems to be on the verge of coming undone if they don't do something to keep the exploited class from revolting or just quitting en-masse.
Do what you love that could realistically pay the bills. Otherwise the rest may well not sort itself out. It's okay to try something with little chance of success for a short time, though, especially during youth.