I can't speak for how other people browse, but when I come across an article with a paywall, I tend to say "eh, it wasn't that important anyway" and leave. Or if it really is important, I'll search for the title and try to find the information on a site without a paywall.
If there ends up being a "browser wall", I'll certainly do the same thing. No article/web app is so important or unique that it's worth quitting my preferred browser (Firefox) and switching to something I like less.
But what's scary to me, as a Firefox user, is that Chrome & Safari are so extremely dominant. If companies are forced to choose between supporting Chrome (60% share), Safari (20% share), or Firefox (3% share), it's clear that Firefox users will run out of sites to use pretty quickly.
Are you talking about neigh-bors? Because houses have those!