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Ask Jerry: Will foldable phones ever be durable?
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New methods will surely make a more durable sheet of Ultra-Thin-Glass in the future, but the biggest way to alleviate the issue is through the design of the phone itself. Very thin glass has a very low tensile strength, meaning that any defect — i.e., a scratch, a nick, or a crack — will lead to catastrophic failure eventually. It's also why you should never push anything except the soft end of your finger onto a folding phone's screen; your fingernail or something hard could dent the glass through the plastic coatings.
Or read this on Android Central