no "major investor" can prevent death of anything. if anything is to die, it will die.
bitcoin won't die and instead will grow bigger and stronger every day even if the price doesn't show it at times only because it has lots and lots of investors, small and "major" that are creating a huge demand for bitcoin which is always there to buy it and use it. and this comes from the real usability of bitcoin in real world outside of exchanges and speculation.
that is not true for any altcoins out there that is why they will die if bitcoin ceases to exist.