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No it hasn't. This is just a myth.

DVD/BluRay were all successful purely because the largest CE companies put their might behind it and pushed it forward. Arguably the Playstation was a far bigger influence.

The Web never had Porn for quite a while (I had a 1200bps modem and remember the early days pretty well). Sites like Yahoo, Netscape etc were the reason the Web was successful. Porn was mostly Hotline Client, Usenet, Private FTP and BBS accounts. Even then Porn was never popular until Quicktime came about.

Didn't the porn industry adopt HDDVD until they realised that Bluray was winning?

Porn has never defined new mediums, it has always followed customers to the mediums they have selected already.

I don't see how the porn industry had a big role in pushing the web forward, care to elaborate?