Real Estate, gold and stocks are so bad at storing value that rich people diversify with art.
The Mona Lisa painting is likely worth over $1B. Scarcity gives it this price, but it needs security, have few buyers, is almost useless and needs to be taken care of. It can also be destroyd. And you need a huge insurance on it.
Imagine what happens when people that puts their wealth in these type of objects understand that #bitcoin is infinitely scarce with no downsides.