As long as the radar dampening range is large (remember, larger is less effective), then sure, I'm fine with that.
30k is still well within the range of most ships, so few ships will be hurt by this change.
EDIT: Oh, of course, both human AND AI forts and superforts should get this change.
Speaking of long range units decimating support stuff, any word on giving transports anti-matter bomb immunity? And do transports currently have sniper immunity?