If the system dies but the idea is alive then people will just build a new system with the same idea perhaps different properties. So bitcoin really cannot die along with BTC.
Not the one you quoted but I'll put in my two satoshis anyway. I suppose this makes sense if you perceive Bitcoin to be an abstract idea that is simply an electronic peer-to-peer cash system. At the same time though, pretty much every single coin out there would be Bitcoin lol.
Also, I don't think purists (the ones who are actually concerned with the
idea of Bitcoin) are at all worried that Bitcoin is going to bite the dust. The only ones worried about this are the ones who invested for financial gain.
But yeah I do get what you mean.