400k is possible only if amazon, tesla, louis vuitton, big banks and other huge/rich companies, started to accept bitcoin. But that would happen for many years considering the fomo, even 50k is too hsrd to reach right now.
I disagree. It would take less than that, I reckon. I would argue that the top 20 exchanges can coordinate a pump to $400k by themselves. You see only 22% of bitcoins are presently in circulation. This is only 4.2 million coins.
Also, it might not take great effort for a market collapse if the largest holders decided to dump their coins.
That means that around 78% of the circulating Bitcoin supply is considered illiquid.
Only 4.2 million BTC (22%) are currently in constant circulation and available for buying and selling.Source https://insights.glassnode.com/bitcoin-liquid-supply/