RSS is either decreasing or increasing. I feel like it’s still working well enough (I use it) but if I’d have to guess I would say it’s decreasing (and thus will die).

What it needs is a bunch of volunteers to implement it for all languages (provide libraries) and frameworks (provide rss feeds by default for blogs and cms).

For the most part it works quite well, but I think some static blog generators, or centralized blog platforms, are not playing nice with RSS (and I’m guessing this is on purpose).