from one day to the next they will decide that its value will be 5000 and the story of market capitalization is over.

XRP at $5,000 is pure nonsense. With a max supply of 100 billion tokens, that would mean a market cap of $500 trillion—which is 5 times the global economy and over 30 times the total value of all the gold in the world. These ridiculous predictions are just clickbait or made to trap naive investors. A more realistic target for XRP, in a massively adopted crypto market, might be $10-$20, but anything beyond $100 is highly unlikely.