1. Accept your fate; live out the remainder of your life the best you can before your loss of memory tears apart the very fabric of who you are.
2. Try unproven, religious, traditional, etc treatments that the rest of us would consider ridiculous, and hope for the best.
I think a very valid argument could be made for #1, but not everyone weighs life with the same set of values. While it may not entirely be wise to seek in-testing treatments, it should be understandable why some would do so.