I'm all for more rules for deployable Ladders, but not getting rid of them. I do have a detest for ladder spam, but I would never want to get rid of them outright.
In another thread I suggested that if you kill 1 ladder in a ladder-chain, that the whole chain dies. This will abolish floating ladders, and make these ridiculous structures very dangerous to build and use. I also suggested that ladders cannot be dropped as items, there's enough of them as-is.