Personally I think forcing manga sites to shut down is a stupid idea since it won't actually help push sales of the actual manga.
I read comics online, and I only purchase those that I really like. If I haven't read it online in the first place, I most likely wouldn't even have bought them. Now I am making assumptions here, but I think the majority of people won't go out and buy more comics simply because online manga sites are shutting down. They would just middle finger the manga publishers and that's that.
Fortunately for me I can still rely on chinese manga sites and I don't think they will ever shut down. I am still angry at the manga publishers for making such a move which will only fuel the anger and not provide any benefits in return.

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