As much as I'm annoyed by paywalls like anyone else, it's not like physical newspapers are providing sufficient income anymore.
Though I think the only way paywalls will be truly viable is with a bundle subscription, something like Amazon Prime for News, where you pay a certain amount per month for access to all major news sites.
Though that's likely to only work if all the outlets can agree to work together on that and also get platforms like YouTube to implement paywalls on video content from said outlets too, so that the ~$13 you spend feels worthwhile for the sheer volume of content and freedom of access you get in return.
At least that's how it was for me with Prime. At one point, the benefits accumulated to such a degree that they became worth the monthly expense.
But I doubt I would've felt it was worth it if I had to pay multiple lesser subscriptions to different providers, even if they added up to the same $13 -- it just feels too complicated.