I don't know about manish_gill, but I certainly wouldn't.

I guess the people running those websites will have to choose between continuing to publish content on the open web, knowing that some users won't look at the ads, or putting everything behind a paywall, knowing that some users won't subscribe.

No, but since it's not difficult to detect that I'm running an adblocker they can feel free to paywall me or just tell me to go away and I will.

I paid for Pandora specifically so I didn't have to listen to their ads.

All the websites? Nope. A selected few who I think provide me a great value as a customer? Why not.