I think that your post is a little bit too cynical. It is not like CD47 has disappeared, and many clinical trials are ongoing currently (15 trials currently recruiting), some with quite positive result (36% of complete response in heavily pretreated patients phase I study) (https://www.nejm.org/doi/full/10.1056/NEJMoa1807315). Other immunotherapies have saved many people something that you cannot dismiss. On the other ends translation from research to an available treatment is a very long path, but we should be excited every time a treatment save a person that should have otherwise died.