I think bitcoin is fine as it is, as long as we find a solution to this blocksize cap soon. Because something needs do be done about it.
It's also the arrogance and stubbornness of bitcoin miners, thinking only of themselves (although that is what you would expect from a decentralised system)
We need to find the perfect balance of democracy and decentralization.
i don't think that anything kills bitcoins, only bitcoin users, with all these buying/selling, panic creating, it sometimes makes price to fall down to 350$ or lover as we know
maybe scammers kills bitcoin too as people leaves bitcoin and sells it, but i don't think that there are many scammers so that's not a big threat to bitcoin