Pretty smart to leave bitcoins for your children because that will make them rich and they don't have to worry about taxes or anything. But maybe it will be for nothing because bitcoin may always go down and maybe another coin will become important.
Bitcoin has a big future ahead and other cryptocurrencies i think has a long way to go if they want to overcome bitcoin. Yes, it is possible but i don't think it won't happen in the near future. Much better if we earn our bitcoin and save it for the future of our family.