You realize they knocked a good chunk of combat stats off duskblade awhile back and the 1-shot of wards was the compensation right? Personally I think that was a good trade.
It's also important to consider the following:
- People often won't even clear the ward with the passive because they are more interested in getting off a gank/kill or farming.
- People who do clear the ward(s) with duskblade are buying you more time to escape or prepare for their gank by clearing the ward.
- Making champs auto 2x vs once won't significantly increase the time it takes them to clear the ward before ganking you... so the change would be mostly meaningless.
It's like asking for master yi to have his q cd increased by 0.4 sec. It basically means nothing in the grand scheme and is therefore a needless request. Furthermore, while you could argue that then it might as well be done to make you and others happy, it would likely result in some other aspect of the item being buffed in compensation... and who wants that?