To beat or not to beat
That is the question...
There's a great interview with Anderson Paak on YouTube where he talks about his journey and commitment to being a drummer. Long story short, there was a point where he committed to treating it like a job and that ultimately helped lead him to success.
That being said, there is large variance in what people define as success. August 16th, 1962, drummer Pete Best was fired from the Beattles. You can read more about the story but towards the end of his life he realized that the Beattles "became a public commodity."
All this to say, make the best of the cards that you're dealt.
Your friend has, in drumming, what very few people have with things, time.
There is a fondness and a love that grows with that time, and it will always be there to love and support you back.
But there are other things to love, I encourage your friend to find them.
Walk hand in hand with the people, places, and things you fancy, for with them, you are never truly alone.