First let me qualify this by saying this is my opinion. Opinions are like armpits. Everyone has a couple and sometimes they stink.
I would much prefer an increase in distance than increasingly tighter marks. Marking scenerios with very close areas of fall are sure to cause handles. When a switch means you are out then the handles come quicker and quicker. Judges are then faced with a decision of which handles were good enough. Two and sometimes even three handles can result in a qualifying score. Seems ironic when marking is of primary importance as the keystone of the rule book.
Adding 50 yards should allow my hunting dog to hunt. Not handle efficiently because I as a handler am intimidated by the old falls. 50 extra yards in many areas allows terrain to become a factor instead of the marking configuration set up of the day.
Lets face it. A well trained dog will understand hip pockets and mom/pops but this is a totally contrived concept. Regardless of the story told during the handlers briefing, I have never walked into a field with 3 blinds in plain view, who then flushed and shot ducks from their feet. It ain't hunting and that is fine. I just love to play the game.
Personally I would like to see more distance.