What will you do when every article on the homepage is paywalled?
What will you do when users provide free mirrors, either pasted in the comments section or hosted elsewhere?
Will you be providing easy-to-use guides for users (new or otherwise) on how to effectively utilize such workarounds?
I'd like to add my voice to the calls for some kind of flair obviating that a submitted link leads to paywalled content, so that I may avoid such links.
But let me take a crack at this. No, pasting the full text of an article directly into the thread is not a good workaround. First, it gums up the thread. Second, obvious copyright issues.
Therefore, if there's a standard workaround like "incognito window", "turn cookies off", or "google the article title", the way to help people is to teach them that. If none of those things work, linking to a different way to read the content (such as a Google cache link or an archive link) is probably ok. Beyond that my crystal ball gets cloudy.