For starts why did you buy a hard wallet when you have no idea of it, before you bought it you should have done your research and etc.. so you won't waste your money on buying one. If you store your BTC on that offline hard wallet I think there will be no problems on that because if today we are already advance on our technology how about the future right?. So I think there will be no code issues or what so ever as long as there is bitcoin and other coins and cryptocurrency. I also believe at by that time we will be able to cash bitcoin and use it in real world but that would take time because BTC is constantly increasing over time there still many variables to play in for the future. So will just see how it goes and hopefully bitcoin and other crypto coins will be successful in the future.