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Which is why, I'm starting to wonder if crypto will really go to zero in the future? If this happens, then most of us will lose our hard-earned money as crypto becomes worthless. What are your thoughts?

First of all, if what I have tried in cryptocurrency is worthless, that is a risk, cryptocurrency is very volatile, right? so by understanding that I have to be prepared for even the worst situation.
On the other hand, I am very optimistic that cryptocurrency will make a big difference to the world, especially in financial technology. This is a big evolution, one day there will be greater adoption of bitcoin. I think so because of some good news lately from Germany, India, and South Korea related to the legality of cryptocurrency.
A cryptocurrency can be worthless if its utility cannot attract the market, otherwise, if its utility is needed and widely adopted it will become increasingly valuable.
Thing is, there's much difference between blockchain and cryptocurrency. The two offers very different solution while cryptocurrency centers on just a digital currency, blockchain covers more. There are thousands of cryptocurrency already claiming to offer a financial solution, the main usecase of bitcoin and till now non of them has been free of the downtrend associated with cryptocurrency and to be honest this is the major reason why people are being skeptical in adopting cryptocurrency.
The way forward is if enthusiasts can focus on the other usecases of Blockchain technology other than just the cryptocurrency application of it, i believe the entire world will experience a new form of decentralization that will provide real pife solutions. When blockchain as a tech giant makes wave, even it's underlying technologies will see more adoption