I don't think Bitcoin would ever die completely. It's just set up to not be able to perish completely, no matter how much stress or opposition to it's existence it'll get. The value may go down significantly; yet that isn't the measuring stick by which it's existence can be judged. Alt coins may rise to relevance or fall each by their merits. One of them may eventually get a large share of the market or even surpass Bitcoin down the road. The ones that come later may barely resemble neither bitcoin nor even any of our known currencies. They may be crypto only by measure of being decentralized. Yet even so most altcoins will in some way benefit to keep bitcoin relevant too as it's the first and most well known. Will Bitcoin ever be a full currency? No one knows; but it will always be the first and with continued innovation it'll grow even more.