Regarding people's predictions about Bitcoin will reach $100k also based on the history of Bitcoin price changes. They do a comparison of every time the price changes after the bull and bear market.
Many think that BTC will reach $100k very realistic when compared to the previous ATH which was at $60k. I also believe that BTC will be very likely to release new ATH as we were able to identify that once the market has hit its lowest price in this period, there is great potential for new ATH in the future.