I have no problems seeing a bright future for BTC, but after a major retracement it might again take many years to recover. Look at the last sell off down to $3700. It took almost 4 years to make new ATH.
So should this be the major, expected drop, it could again take many years for BTC to reach 100k.
Many people will be dead before BTC will reach 1 mio.
Yes need four year but when bitcoin above $10,000 look easy make new all time high, maybe support with many project and company make bitcoin dominance in global economic. How ever if bitcoin only have investor impossible can make new all time high for bitcoin price, have company want to publish with investing and accepting bitcoin make all people now believe and hold bitcoin.