I'm afraid of that too, yes.

Still, things like these will effectively prevent Bitcoin from gaining real market penetration. The people using these JS miners right now are as a matter of fact going against the interests of their website users for this - they will feel that it's not worth the hastle, sooner or later. I very much hope that they will LOSE users this way. We should make a pillory thread so that we all know which websites to stay away from. Maybe even Google will mark the sites as "Malware"? I really do hope so! And they have very good reason to do that. After all it's in their interest to prevent their Android users from visiting those websites...

Besides that, I hope that if you compare the gains (a few 0.01 BTC every few days) vs. the losses (in users visiting your website), you will notice that this system has no real benefit. JS is clearly not made for Bitcoin mining.

But who am I talking to... too many people here only want to trade Bitcoin for $$$ anyways! Too many people that aren't the least bit interested in Bitcoin's reputation. I think we shouldn't give these people a forum here to speak out about their wicked plans, anyways.