Sorry, but we're all just fellow users here and have no insight into Apple's plans for future updates. You can comment to Apple via their feedback page, if you wish:
I'm not sure what you mean by "lack of security" and "special WiFi ports", though. Can you perhaps explain what you mean? Someone may be able to suggest methods or workaround.
AirPlay is only using pretty standard ports - 80, 443, 554, 3289 and 5353 - so it's not something most sites would have blocked or other normal network functions from most platforms won't work either. Hence is really shouldn't be a security issue. If you're blocking those ports, you may want to revisit that and see if it's really necessary. If you must block those, then AirPlay probably just isn't going to work for you. Changing would probably require Apple to revamp much of its networking structure and use even less common ports.
A more common issue in large institutions is the problem with dealing with multiple WiFi access points and the need to have the iPad and the Apple TV on the same subnet. Those are often more difficult issues to solve.