Actually, I'd prefer it if bitcoin was adopted by the porn industry, because it shouldn't be shameful to use it with anything. You can also pay your bills with bitcoin and if you can buy porn and drugs with fiat cash then why not bitcoin? If we want bitcoin to succeed as a currency then people should be able to buy absolutely anything they want with it... even illegal stuff and that's just up to the authorities to police.
Oh, and fuck the ignorant perception of society. They'll change their mind over time, but then it'll be too late for them anyway.
As long as there is some taboo associated with watching porn, bitcoin is a natural fit for the porn industry. Credit card companies and banks sometimes have hesitation in dealing with porn companies. No such issues with bitcoin. I think the proportion of porn sites accepting bitcoin should be already high.
The majority of these people have no clue how to use Bitcoin to make it anonymous, so they should stick to the traditional payment methods and be done with it. The only positive side, as you have stated in your post, is for the porn industry. The credit card companies have no more control, on what they will support and what not.
If the porn site make use of payment processors, they could be in the same position. These companies can also block payments to these sites through their service.