Well I would personally say that a good chance of at least 20 years for a kidney just using today's medication like Tacrolimus and MMF is pretty good. And they do not kill other organs you are just making that up.
Risks of transplant include:
Blood clots (deep venous thrombosis)
Damage to the kidneys, liver, or other body organs from anti-rejection (immunosuppression) medications
Heart attack or stroke
Heart rhythm problems
Increased risk for infections due to anti-rejection (immunosuppression) medications
Wound infections



Nah just joking, but apart from religious reasons why should you care what happens after you die, if it can give a person one more week then it's worth it!