Warren buffet can not remain a bitcoin hater forever till his end, except he just wants to live in self denial, and to be honest, I believe that by now, he must be somewhere wondering how wrong he as been all the while he as spoken ill of bitcoin.
The problem with some of this big and influential men is that, pride never let's them accept reality, and even when they see that they were wrong, pride won't let them come out publicly to own up to that and right their wrongs.
But however, I believe that someday, buffet will have no choice but to accept and buy some bitcoins for himself and his children, and I believe that this move may likely pump the pric3 of bitcoin since his followers who also believed not in bitcoin, will turn around to believe in it and invest in it too.
To be fair, he is an old dude, 90+ years old as far as I know, and he is doing marvellous with stocks and making good returns. Not that he needs to anymore, at this age he could start doing some badly, but with the amount of stocks he has on strong foundation companies, I doubt he would do too badly.
It means, he can deny bitcoin as much as he wants, if he purchased just a billion dollars worth of bitcoin on the very first day he was asked about bitcoin, then he would have more money than he ever made on his entire life by now. But he denied that chance, and hated it, and he has the right to do that. When you are as rich as him, you do not need every asset, he could hate gold too if he wants, because he makes money and wealthy and very old, so he doesn't need to change anything.