I know it's just an example, but someone who understands programming work would probably not be against learning another language or two and trying to get more

I know it's just an example, but someone who understands programming work would probably not be against learning another language or two and trying to get more interesting work. They may question whether the language will make you happy. Similarly they'd ask someone switching to art whether that would really be the path to happiness, are jobs available, what kind of salary to expect etc. I wouldn't tell a friend not to pursue their dreams. But I would look for good arguments that they actually understand what they want.