Some people have the longest wait time but don't get a good enough tissue match to ever get a call. I am not talking 6 of 6 antigen, but on your local list.
I have been told that I have very rare tissue typing and will not be getting a call anytime soon. Statistically the Red Cross said I have the lowest probability of matching a donor organ. Cadaver kidneys go to the "best" match regardless of wait time. I will eventually be offered one, once I have done the so-called min wait time. It will not be a perfect match. The wait is about 6 years.
Although people win the lottery every week, so someone out there might be close to me you never know! I can hope anyway.