The topic is specifically about safely transferring your Bitcoin to your next of kin or heirs and not about trading or investing in Bitcoin.
From some of the replies in this thread, some important points have been raised which are keeping your keys safe to avoid destruction so engraving your keys in a fireproof and waterproof material such as steel might be a good option. The next point is to educate your dependant about Bitcoin if they are of age to understand it. Your wife or grown-up children should know about Bitcoin passwords, keys, recovery, security, etc. Regarding how to transfer these keys options like having a time lock safe, and using a lawyer or an executor have been suggested. This discussion summarizes that you should look for a suitable means to ensure that your coins are safe and transferred to the right person or persons after your death.
This is one of most important point we all are missing i.e. transferring knowledge to your next of kin. Lots of Bitcoin are gone to darkness forever because owners passed away and the next of kin either don't know about the Bitcoins or don't have necessary knowledge to access those Bitcoins. This is one of key limitation of bitcoin, in fiat system your next of kin has complete access to your fiat based assets. So we all need t pay attention to this aspect of Bitcoin.