It's a slow process, but an inevitable one. Twitter has demonstrated this, where it isn't this instant switch, but a slow burn. We're only now getting Meta's take on such a replacement for example. Same will happen with Reddit now people are aware how fragile it really is. I just don't see direct replacements happening this year.
Anecdotally I do see far more aggressive displacement on Reddit than I did with Twitter however, perhaps due to how impersonal Reddit is where most feel they can abandon it much easier than a Twitter account with many professional colleagues attached.