I fail to see why a scientist won’t be interested in the grant now. Maybe if you’re talking about some areas like social sciences, yes, but for everything else not much seems to have changed.
The instability this has created has me looking to leave academia as quickly as possible; I'm sure others in similar situations are having the same thoughts. This has wreaked havoc on all of academia.
Sorry to hear that this happened to you. I hope they will provide some way to sort this out soon.
If the dominant ideology changes, it should only affect future grants, not current grants. Ideally, grants that have already been submitted or are close to submission should be evaluated according to the old rules. Otherwise a lot of time and effort will go to waste.