No one knows exactly about the future of bitcoin, it's all just predictions, and so-called predictions will be right or wrong. As an investor in bitcoin, we need to trust in this asset, because once its price goes up, we can reap a lot of benefits from it. But investing beyond profits will always contain risks, so only invest with money that you can lose, never borrow or use daily living money to invest. Never put all your eggs in one basket, especially with risky investments like cryptocurrencies.
Nothing wrong with a prediction as long as it is based on data and makes sense. But if someone claims Btc will be at a certain price without any reason, it is totally wrong.
Sure, as an investor of BTC, we must believe that BTC price will increase significantly in the future. We already learned the history of the previous bullrun seasons, it is very possible to happen again in the future. Moreover, BTC becomes more popular and its adoption looks good. However, you are right that we must invest in the amount of money that we can afford to lose. Never think to invest all the money in BTC, it is too risky!!