Considering he was able to buy hosing on Amazon’s server farm and used to own his own server farm- plus the amount of resources The Jester needed to take him down once, I doubt a simple ActiveX script will do much, and I am sure that Assange has some massive funding behind him (Soros?)
100 people running this simple script can cost him a LOT of money and possibly irritate his hosting company enough to decide he isn't worth the money.
That's your position and it's technically correct. But I see it as anything that can make it more painful for him is a victory.
I let the script run overnight while I sleep and usually download well over 200GB just by MYSELF... and it costs me nothing. Imagine if 1000 people did that. The impact is a lot larger than you are making it out to be.