Lets just look at Cons for Jagex when it brings back free trade, etc
- Bots? - This already exists and JagEx just can't do anything about it with the new reflection ones. Instead they will gain (member fees) when new bots of goldfarmers comes in which are realistic. Realistic-looking bots will make other players less suspicious and hence they won't complain.
- Real World Trading: This isn't even an issue for JagEx. Its already going on too.
I honestly don't see any reason JagEx should be concerned rather than being happy about releasing it.
Only thing is they might receive more complaints about luring, duel arena scamming etc, which they can handle by adding few more people.