Bitcoin cannot be held forever because even the investor can't live forever, it's only held for a long term and if opportune be passed from one generation to the other but in rear cases which I have not seen, because most investors tends to be more careful with their investment interns of making their seed phrase known to their family for easy transition that is where the lost of the investors investment comes in where he is no more, only if the seed phrase and password are being kept a d pass on to their inheritance that is when we can say one can hodl Bitcoin as long as it exist.
Bitcoin passed from one generation to another but in rare cases, it's only appears rare to you because bitcoin itself is not yet a generation old, when bitcoin becomes a generation old and we happen to still be alive, I bet you will see alot of bitcoin that's been passed from this generation to that next one that is coming, it's not rare at all.
And let me also say that it's true that some may lose their fortune to the Internet due to not letting their wife, husband, children or family relative in on their secret phrase that gives access to every of their online crypto investment before they pass, especially this days that even young people die faster than the old ones..
But I believe many are beginning to learn to have that one trusted person they can open this things up to incase of any thing, some are writing letters and keeping the letter where it can easily be found if they are gone, this latter reveal where their seed phrase can be found and who ever has the letter can retrieve all the money contained in the wallet that owns the seed phrase.