Nothing in the OP states dissenting opinion should not be voiced... again if you make a statement on a discussion forum, expect all aspects of said statement to be discussed...
Wait it was predictable and even anticipated that not everyone would agree with the statements in the OP... color me shocked, and yet nowhere in the OP does it state only those who agree with my premise can post here. You want that maybe you should go start a thread for that and make it clear in the first post only those of like-mind are allowed to post in it.
Also... what characters (without some type of special ability around movement) can cover 120ft to 100ft in a round? If they could it shouldn't be a problem since then melee wepaon wielders could close on ranged characters. See when you make statements like this, it causes me to wonder if maybe the issue isn't the game.
Wrong that's not an answer, since everyone who runs dynamic, campaigns that don't take place in a series of corridors and rooms isn't experiencing the same issues. That means there have to be other factors, what are they? You would think that since they occur in a wide variety of places and circumstances that unless they are 100% controlled by the players (which is an issue in and of itself) there would be some that favor ranged and some that favor melee... why is that not happening in your game, that's how my dynamic campaign that doesn't take place in a series of corridors and rooms plays out? Perhaps if you were more forthcoming with details I could identify your problem(s) and perhaps help you in building better encounters or better DM in-game play with opponents that would alleviate said issues you are experiencing or maybe there's something else that's the answer... instead you've blocked off a path that may have the answers to your issues because... well I'm not exactly sure why... maybe because you've already determined (right or wrong) what you believe the problem to be??