Many tokens have come and gone in the crypto currency market, let me be honest with what I actually think, I think the number of dead tokens, that is, tokens that have come and gone are far more higher than the ones that are currently existing..

And bitcoin isn't the one killing this tokens if I am to put this the way you put it in the topic of this thread, the tokens are the ones killing their selves respectively speaking, due their weak foundation and fundamentals, or I would rather say the management of the tokens/project.

And one thing we all must be aware of is the fact that most devs of most Altcoin projects design the project to fail after some time because they do not have the capacity and neither the interest to run a long term project, they just want to make money in the short term and vanish, this is why we all must be very careful of the type of Altcoins we are putting money on, if and when you are not so sure about the longevity of that project, better to invest in bitcoin that has a good track record already.