As of right now, the bitcoin price is expected to keep going up in the next 20 years. But can it last that long? I believe it's possible. But can't it crash at a random time? Like the price going down hard.
Bitcoin price can rise and fall with great uncertainty. No one can really say for sure if the price would continue to rise or fall. It depends on the supply of Bitcoin and demand for it. Bitcoin is a deflationary currency, because of it halving. Every 4 years ... I think, block reward halves and supply decreases. So a decrease is supply often invokes an increase in price.
Plus with the mainstream media attention Bitcoin should thrive in demand. Thus we have a situation where the price would rise, but if the demand was to fall all of a sudden, then yes, Bitcoin can become worthless.