Agree with this heavily.As long as drains won't be level locked - traders will be OPd. It doesnt matter if drain lasts 3 mins or 30 seconds, it still does, can be refreshed while target isnt available to do anything.
The only chance to rework this, as i see it - trader drains should be similar to AAO/AAD drains. If you drain AAO from target and pop AAD drain - it overwrites AAO one, and vice versa.
Split trader drains into 2 categories - weapon skill drains and nanoskill drains. Alright, my enforcer won't be able to cast nanos, but weapons will still be 100%, then again, if weapons are 75% - then I'll still be able to cast my nanos. That will help people to either escape, or simply kill traders using barrow strength and other tools to remove roots.
Besides, nanite drains and all others are pretty OP as they are, while still have pretty low nanocost. I'm clearly sure trader drain nanos should have their nanocost increased greatly, so lowbie traders won't be able to spam those for long on multiple targets without losin all the nanopool.