Can’t speak for journalists at large but so far Mastodon and threads have managed to keep me personally connected to most of what matters. I do like the trend towards substack for a few reasons:
1 - it normalizes the idea that folks should pay for premium content but still offers authors the option of writing non-paywalled posts - this is a huge step up for the idea of having a vibrant ecosystem for journalism that isn’t ad-supported
2 - they’re trying really hard to woo the media from X, which really pisses Musk off as a bonus
The downside is that it’s a walled garden, even if it has peepholes of free content, with all the issues that bring. But it might be the best option for the moment, anyway.