It's more like the patient needs some fixed amount of food each day and it doesn't make a lot of sense to create lots more food than they need on the hopes that someday they'll want to eat more than they can.
If the argument is that everyone should focus on the arts at the expense of everything else, it's hard to imagine that's an ideal outcome relative to alternatives. If we're not arguing that everyone should focus 100% on the arts (no other degrees should be available), then it's a matter of degree and certainly some outcomes might end up with more people pursuing the arts than what society needs.
If the argument is that everyone should focus on the arts at the expense of everything else, it's hard to imagine that's an ideal outcome relative to alternatives. If we're not arguing that everyone should focus 100% on the arts (no other degrees should be available), then it's a matter of degree and certainly some outcomes might end up with more people pursuing the arts than what society needs.