Your title is alarmist. Soon might be relative but the science referenced indicts the collapse would be after 2100. That does not seem soon to me.

"Scientists can’t say for sure what the further consequences might be. But, Rahmstorf said:

If we continue to drive global warming, the Gulf Stream System will weaken further, by 34 to 45% by 2100 according to the latest generation of climate models. This could bring us dangerously close to the tipping point at which the flow becomes unstable."