I do however agree that they need to get the fuck down if they are the only ones left and there is no ladder to them.
So an infantryman who decides "It's easier to first kill the squishy archers, removing the enemy team's support, and then engage those tough ironclad infantrymen who stand there without support" has bad luck, because the map grants the enemy team a safe position for their archers? Why should the archers get such a good benefit and other classes should not? And what about the very important aspect of cavalry hunting archers? It is completely removed by ladders!
Ranged are support, they do not win matches, infantry does (or cav on flat maps). People who believe otherwise are just frustrated. One could simply argue that cavalry needs to get their horses removed because only 1/2 or 1/3 of the team can [actively] engage them. Or shields being OP because only 1/2 - 2/3 can affect them, and so on, and so on..
1st: ever fought against a few archers who survived until the end of the round? Even as shield infantry you are doomed, as they probably run faster than, you, all they have to do is to sorround you and you are dead. So I say 3 good archers win against 3 good shieldmen.
2nd: I repeat: usually if you can't harm an enemy he also can't harm you. The only exception of this are horse my old friendchers, that's why I call them horse my old friendchers. It's the pussy way of fighting. Thank god they are not really effective. But an archer on a roof can easily block passages and alleys where a two hander or cavalry would charge through, and doesn't need to be afraid of them by doing so. It's just "Haha I can shoot you and there is nothing you can do to stop me from, except of hiding and thus removing yourself from the battle. Haha."
Removing ladders will prevent rooftop camping, but it will also remove the ability for Everyone to take different routes (where possible).
Imo, it will simply make for lesser gameplay.
Then place barriers on the rooftops and "good" sniping position, so the archers stay on ground and have to fear more than only enemy archers (I know, a horrible thought, ist it?), while all the other, brave classes can use different ways.