Reddit is currently deeply integrated into the cultural zeitgeist. Much in the way that Digg used to be the discovery mechanism for the forefront of internet culture. Then v4 hit and everyone fled to reddit. Yes, Digg is still there but it's not the Digg of pre-2010.
Twitter is still around post-Elon, but with a lot less relevance and lot fewer legitimate users.
Reddit will still be here in a year, no matter what. But it may look very different than how it looks today.