Twitter has no positive correlation with dogecoin's emergence. It was just Elon musk's influence which contributed with the previous uprise on its price.
To answer whether it is dead or not, unfortunately it could be but it can also still recover. That's the problem with tokens having no utilities;they tend to rely solely with demand. So if there are no demand for it, you won't see its market value reaching ceilings. Unlike with utility tokens wherein , its usage could be a factor to catch the interest of investors towards it giving a stronger support for its market value.
This is true, and today we are seeing how crazy that dude could be, and how there is a big blowback to him. He does polls about many things and always loses for one single reason, the users of his own company doesn't think the way he thinks and that's the issue. He asked about so many things and in the end he literally lost the "should I step down as head of twitter" lol.
So, this was the guy millions invested their money into doge because he suggested it, imagine being as delusional as investing into something just because a weirdo said it. Maybe there are some people who like him for what he did, which is respectable, but do not respect who he is.