I'd rather invest into something that is highly volatile but almost certainly appreciates over time rather than something that depreciates at a predictable yet increasing rate.
We could discuss the fact that BTC might be overpriced or underpriced, nobody really knows. But that it's going to go up in value (in terms of purchasing power) in the long term is, black swan events aside, almost a certainty because of its engineered stock to flow.
Scarcity is real whether it's physical or digital (as we've seen with art, collectibles or more recently NFTs). Gold is a good store of value because of historically predictable scarcity but it's not predictable with certainty. Bitcoin is. We'll know exactly how many bitcoins are in circulation 10 minutes, 10 days, 10 or even 100 years from now. If anything many will be lost, which will contribute to its scarcity.
Will Bitcoin be replaced by something else in the future? Almost certainly. But let's not forget that unbacked cash has been around for just half a century. Even if Bitcoin is replaced by something 50, 100 years from now that's plenty of time for a couple of generations to use it as a store of value (and payment system).