Bitcoin is worth investing and holding for the next 10 years, because with scarce supply and increasing demand over time, bitcoin price increase is inevitable. However, that doesn't mean that anyone who invests in bitcoin now and holds for the next 10 years will get rich and make millions or billions of dollars.
Bitcoin's potential is still huge and can yield significant returns, but it won't be able to generate thousands or millions of percent returns like it did before. The days of getting rich quick with bitcoin are over, and the profits we make will depend on our capital and holding capacity. The larger the capital and the longer the holding period, the greater the chance of making big profits.