Cool statistic, but meh. Comparing the marketcap of a digital asset to a business simply just doesn't make that much sense. Call me when bitcoin reaches gold's marketcap. 
Slowly it can make it. First take over Buffett and make him change his mind. He invested in gold and nothing in Bitcoin, maybe he will understand one day.
But I think you are right, gold is the real target, and comparing Bitcoin with companies is just for the news headlines.
$10 trillion USD market cap could happen with increasing adoption. Price will have to grow to $400k-500k and it will not happen in the next two years but perhaps in ten it can be achieved.
I don't know if Buffett has really zero portfolio in crypto, in any alt out there. Maybe he is just silent about it even if he says he doesn't like bitcoin and he will never own one. BTC is already in the 24k level, is he still going to say that crypto has no value as per his statement in this article? - https://www.cnbc.com/2020/02/24/warren-buffett-cryptocurrency-has-no-value.html
But the comparison table from the OP is really a very inspiring one for all crypto enthusiasts. Interesting if it will go up in the top 5 in the future.