I believe that you are correct. But, I would add: as long as Bitcoin remains the best-in-class of digital money.
If, one day, Bitcoin is replaced by another product which would inherit only its benefits (peer-to-peer and security of transactions, open ledger, etc), without its flaws; a collapse could happen. The major reason of Bitcoin (and clones) not to be accepted as a day-to-day currency, is its high volatility on the markets - clearly shown on the previous chart. For a currency to be considered "functional" and "desirable" for that purpose, the price has to stop increasing. Some fluctuations are tolerated by currency markets, but never to the extent demonstrated over the last 4 yrs by the Bitcoin model.
That is not the speculators fault entirely, it is due to the fixed release rate of Bitcoin. Bitcoin can't increase production of its units during time of high market demands - the supply is limited, by design. Therefore, by design, the price can only go up in those conditions. Basic economic principles.
This will remain true, until the specific model is no longer needed, because it has been replaced. It wouldn't be the first time a good idea evolves into a better one.
In my opinion, the question is not a matter of, if Bitcoin will be replaced - but by what, and when?
Until then, enjoy the ride!
I see a post exactly like yours almost every single day, either on bitcointalk or reddit/r/bitcoin or somewhere else. It's like all of you guys are believing something will be true without thinking it completely through. Just saying something will happen some day doesn't make it true or even remotely possible.
So let me ask you a very simple question. Let's assume for sake of argument, that a cryptocurrency's price stability needs to be at ~$100k/unit (and in the hands of over 200 million users/holders) to be considered stable *enough* to be used as a viable currency. So do you believe that one day a better cryptocurrency will just pop into existence, and will have an overnight valuation of $100K/unit immediately upon entering the market, and immediately dispersed to 200 million+ users and millions of merchants accepting it?
If your answer is Yes, then there's no point arguing with you because you believe in something that will never happen, ever.
If your answer is No, then you must realize that any competing cryptocurrency's value will have to be
grown from the ground up, just like bitcoin's. And currently, bitcoin has the lead in network effect of exponential growth. Any other competing cryptocurrency, while it matures in valuation, will have to go through the *exact* same volatility as bitcoin. And if this is true for all cryptocurrencies, then why would anyone switch horses from BTC to a less mature cryptocurrency when the ultimate goal is to get to a viable market saturation, merchant adoption, and thus relative price stability? It took bitcoin 4+ years just to get the valuation it has today, and so it would with any other.
Not to mention that Bitcoin is open source and programmable, and can take on new features any time the core devs and miners decide to incorporate them.