We're in decline, but I don't agree with the doomers who say we couldn't turn it around, long-term.
But turn-around is only probable if the population isn't constantly diluted with large numbers of newcomers. Especially unproductive ones with an incompatible culture.

We're not mass-importing Brazilian engineers, Indian software developers, and South African doctors, after all. A lot of us wish we were, but they're usually like, Nah, bro. Have fun with your Muslim fundamentalists and sky-high taxes, bro.🤙