I think that Stuttgart 21 will eventually be unbuilt. The Polizei were actually beating people up over that. It’s superfluous anyhow, and the cost overruns will swallow it whole.
Stuttgart-21 will be finished...but based on various stumbling blocks....it’ll be at least three years late (my humble bet). I’ll also bet that it exceeds 20 billion Euro (it’s not supposed to pass the 6.5 billion mark).