It would still require that the company that develops the cure could make more profit off it than it would make with chronic treatments.

So if you went purely for profit, you could only develop a cure if:

- you could price it higher than the price of the chronic therapy over the full lifetime of a patient.

or

- you could sell it to more patients than you could have sold the chronic treatment. A lot more, because every patient will only buy the cure once.

So even then the incentives would probably lead do driving the price of drugs up significantly. You'd also still have no incentive to actually eradicate a disease.