Regarding the original subject, it seems that the ladder could case more groups to try to summit on a nice day, which would not really solve the problem. The problem seems to be way too many people in a dangerous place at the same time, with no real cooperation between all the parties involved. All the focus is on getting as many clients to the top as possible, as that is what will drive next year's business. And Nepal's only incentive is to collect as many permit fees as they can.
It seems that a lot of people pay a ton of money to do something that may not really be fun or enjoyable, just so they can say that they did it.
As for the ladder, go ahead and put 2 in (1 up and 1 down) since there is already one on the North side. But just pray that a storm doesn't blow in when over 200 people are trying to summit on the same day.