This will severely hamper our collection of intelligence. Our allies are probably right now wondering whether or not to continue sharing intelligence.
Intelligence agencies don't 'wonder' whether or not to do things that might compromise their agents and sources, without any clear and immediate upside. They just stop doing the thing that is identified as a risk.
I would be shocked if any US ally has not already stopped sharing anything sensitive with the US.
The default position is to protect your sources unless there is a massive and compelling reason not to.
During WWII, the allies were prohibited from acting on hard information gained via the breaking of German codes, unless there was good intelligence from at least one other source; this meant that often commanders had to allow a disaster to unfold, because preventing it might have tipped off the Germans that their communications were not secure.