You can tell what a con is at 500 yards, dont be silly. From my experience in gliders I'd say you could ID a con positively at about 1 mile (approx 1500 yards) Again,this is gonna vary between Granted, ID at 8000 yards is probably optimistic.
as to no range icons, well, thats nice if we have depth perception, but we wont. Like HT said, ranging was done using ring sights so i guess if they made those standard in AH it would be ok.