The phrase "a collapse of existing" is correct and usable in written English.
It can be used in contexts discussing the failure or breakdown of current systems, structures, or conditions.
Example: "The report highlighted a collapse of existing infrastructure, leading to widespread disruptions in the city."
Alternatives: "a breakdown of current" or "a failure of existing".
At risk is not just the collapse of existing treaties, but a whole manner of interaction between Russia and the United States that has been crucial to maintaining stability over decades.
Plan B is a managed no-deal that would extend the transition until December 2021 to give both sides time to prepare for the collapse of existing trade arrangements.
And since the collapse of existing socialism in the early 90s, the left has been searching for a new language, for new ways to mobilize the people who need to be mobilized.
One scenario, called Oceans Back from the Brink, describes a public talk given in 2070 about how an artificial-intelligence system released all forms of confidential data, which prompted the collapse of existing corporate structures and renewed conservation efforts.
1 In general, microtubule-stabilizing agents have antiangiogenic actions, 5 while microtubule-destabilizing drugs often having vascular disrupting activities associated with collapse of existing vasculature.
The diameter shrinkage after random rewiring often indicates a collapse of local "community" structures existing in real-world networks.
This paper presents a numerical study on collapse analysis of existing high-rise SMRFs under long period ground motions over the design levels.
And there is most likely a collapse of the pre-existing information systems.
Progressive collapse resistance of existing building structures against sudden column loss may be increased with adequate supply of steel braces.
Finally, using constructed fragility curves, collapse probabilities of existing public buildings were estimated according to PGV values.
