Bitcoin could have been and gone in this timeframe. Something much better may also take over so bitcoin is far from safe or indestructible.
as long as its technology will be alive i don't see the problem in anything a better bitcoin, remember that no more bitcoin doesn't necessary mean that there will be no others option in the cryptoworld(so if bitcoin will die, than another "bitcoin will rise", in the end you can't kill crypto anymore
The one main problem is Hackers because they can hack some accounts that having a bitcoins but im sure that bitcoin hires best security experts for secure the accounts