I have my 90% asset in altcoin, and all of them are altcoins, not bitcoin. But I can convert them to bitcoin any time, if I want
I think of course you can not convert it as you please because you certainly will wait for the right price so you do not get damages
He has already welcomed the risk at his doorsteps by investing 90% of his assets in bitcoins as if anything goes wrong with bitcoins in future then I hope he don't get bankrupt.