What is the alternative, keep all of your bitcoin until you die and then tell your kids to hold them until they die so forth forever? That makes no sense at all, if you are not using it, it worths zero.
I don't think so. No one is enforcing you to hold bitcoin forever but people are always emphasizing to use bitcoin instead of encashing it. Because, one day we will be able to buy everything for bitcoins and the right now I guess that I'm able to buy more than 50% of my life's need for bitcoins even I'm not from tier1 countries.
I guess there will be no sin if you get to inherit some portion of the bitcoin stash to your next generations. Because, definitely you will be doing that with fiats and properties then why not with bitcoins. It means you do not need to spend all your bitcoins within your lifetime.
People in my country are not allowed to use bitcoin no matter the purpose is. And even if bitcoin is legalized, i guess holding is the main target of most people. Selling bitcoin or using bitcoin for daily needs are considered insane because you might be in a depth of regret. As usual, the price of bitcoin always increase over years. Threads and discussion are made to express how awful they feel when they use their bitcoin to buy nonsense things (including pizza)
Thus, I accumulate my bitcoin for myself as well as my next generation