There is no guarantee the cure will be cheap or even cheaper compared to the current situation. Not to mention the increase in other medical conditions that are bound to occur in the added years of life and add to the total medical bill.

Also, note that this investment money is directly related to the number of working hours. All those people working on a cure in labs etc. will have a very different experience in life compared to those same people earning the same money for caring for their fellow humans. It is not a purely financial weighing.

It's all good and well making statements like that but, and at risk of repeating myself, you cannot stop treating people just because you want to spend more on research. And even if you did magic up more money to spend on research, there's no guarantee that a cure would be found by 2050. Or even if it's curable at all.