I wouldn't say MVC is dead in the front-end, rather I would say MVC is a necessary stepping stone towards modern front-end architecture. It still has some kind of model, view and whatever the controller is called.
Before the time of Single page applications, MVC was not practical as the state of the page would be destroyed as soon as you click on a link. With the whole "single" page approach your page lives on and your applications remains. This was the considered the "holy grail". We are thought all the problems are solved, but then came the performance and memory leak issues. Because the page lives on throughout the user journey, memory management became a problem.. and so was SEO. As always front-end will continue to change rapidly year after year and it's now all about Flux/Redux and Universal javascript?
Saying MVC is dead is like saying "CPU" is dead, no it's not, but it will always keep on improving.