Justin Drake believes that the cost of attacking the Bitcoin network may remain as low as $20 billion, even if Bitcoin reaches a $200 trillion market cap, making it vulnerable to a 51% attack despite its high valuation

Quotes that support claims

If fees were the only source of miner revenue today, revenue and hashing infrastructure would also decrease 100 times, putting the network at risk of experiencing 51% attacks. Drake stresses that if bitcoin rises to $1 million with the same level of fees collected today, it would only represent 10% of what miners are receiving today, also opening the network to attacks. “Bitcoin would be a $20T asset secured by 1/10th of today’s hashing infrastructure,” he detailed.

Thus, he believes that the cost of attacking the Bitcoin network will not increase even as the price of BTC increases. This could make it possible for a 51% attack on the Bitcoin network to cost as little as $20 billion, even if the network has a market cap of $200 trillion tokens.