How much does the program cost in relation to what it returns in benefits?
If the benefits outweigh the cost, keep the program going.
If the reverse, ‘junk it’.
Unfortunately this is not an appropriate analysis to make if thinking only in terms of money.
Ultimately, the criteria of success and failure are often a matter of agreement.
The people responsible for the program may commit themselves in advance to a particular outcome that will be regarded as an indication of success.
If that’s the case, all you need to do is make absolutely certain that the research design will measure the specified outcome.