Altcoins will always remain dead. Majority of them just make false promises and give you all kinds of false expectations to put money in their pockets. Although I must admit ALTCOINS will never actually be dead because they will be used for pump and dumps. If you are lucky and quick enough to jump on a trend then you can make BANK with Altcoins.
Maybe there will be more dead tokens in the future because the rate at which many of the cryptocurrency project are launching, it means that investors would have no option later than to keep moving money from one crypto project tomthe other. This is what we would be experiencing and any project that eventually loses it community due to negative outcome, they would have to keep doing airdrop in order to bring back the users to their platform.