Except that's usually wishful thinking. It's not easy to get the same result with less cost. You can probably make the system better, but when you do the clean up to make it more efficient, something is going to suffer, and it's not a given it will recover with time.
That's the downside, I agree with that. IMO (I don't want this going to the Chat thread), that economic conservatives make decisions with too much wishful thinking. For example, they want a high risk pool for health care. But two reasons why it won't work are 1) You will never know when a person will get sick and therefore the budget is uncertain, and 2) Since you hadn't invested in more preventive systems such as Obamacare and (to a much greater extent) Universal Health Care, you can expect costs to run out of countrol since the diseases that could have been prevented and remedied at an earlier stage was not curee because they were deemed "non-high risk".
I find that conservative reasoning flawed: no economic and health situation is perfect, and that is why the economy must be tailored in a way that prevents excesses, such as crime, geeed, disasters, and health failures.
However, if there are really needless stuff out there, just remove it.