Any arguement taken to its extremes will start to seem absurd. I understand how silly it sounds to have some level 200 chars stomping on level 1 chars.
My assertion, however, is that there is no acceptable way to stop it. The current proposal says that healing and buffing won't be allowed in the immediate area. This is insufficient. As has been pointed out, people will simply move to just outside the area and perform these actions there.
Logically, we would address that by extending the "no help" zone farther and farther out. Quickly, we get to the point where buffing "out of range" chars is illegal in any zone that has towers of QL150 or under. Even this is insufficient because of towers that are near a zone border. So, then you get to the point where no "out of range" buffing of any sort is allowed anywhere at any time. Personally, I consider this too large a change in the game mechanics to be considered viable.
But even if we disallow "out of range" buffing on a global level, that still isn't enough. Those same high level chars could simply give money and items to the low level people they can no longer buff. In some ways this is better for them, because this form of buffing doesn't require the high level char to be present to be effective. So if we really want to stop the high level char from interfering, we have to disallow trading "out of range". But of course, this is also insufficent. It's not necessary to trade items from a level 200 to a level 1 char, an item can take multiple trade steps from the level 200 to a level 180 to level 160 and so on.
Again, there simply is no acceptable way to implement this as long as chars of vastly different level are allowed to intermingle. No one seems to like my "split the servers by level" concept, so I'll drop that. But I honestly don't see any other way.