I've already written down my wallet details , and how to access them, a brief guide along with my bank account details. So when they check them they'll see and hopefully someone understand. well I've already told them about it and they while they mainly think I waste my time they do have a small idea.

But yeah, what you're saying is true, they can be number of reasons to have a less circulation even after all the bitcoins are mined. well it will already be like that, because we've seen some sad videos people already lost their wallet addresses, hard drives that they mined bitcoin, saw an video of someone loosing 20 Million USD value BTC by thinking it's not important, he mined them in 2009 and he recycled the hard drive and those BTC will be lost forever.