If you first heard about blockchain in 2017, and have followed the recent price action over the last year, then I dont blame you for thinking Bitcoin and other cryptocurrencies are dead.
actually anybody who thinks "bitcoin is dead" (i wouldn't include altcoins in it because most of them are dead coins walking) is to blame because history is not something that is hidden away. it is easy to find and access. there are hundreds of sites and exchanges that have a chart showing the price history of bitcoin which they can easily look at. not to mention that they should not just consider price but also utility of bitcoin which has been increasing every day. it is about all the merchants that have been accepting bitcoin as payment, all the millions of dollars that is being transferred through bitcoin on a daily basis! and a lot more.