Paywalled research is just a bad idea.
Yes, I understand that the peer review and publication process has to be paid for, but restricting access to the fruits of scientific progress -- and therefore also limiting further progress! -- is the wrong way to do it.
My guess is that we'll transition to an "author pays" model. Researchers employed by institutions will have their fees covered by their employer. Researchers who don't have that option are already disadvantaged under the current model, so the fact that they'll still be disadvantaged isn't so terrible. Plus they'll still be able to publish in free online archives that accept non-reviewed and unedited work. Really good work should find it fairly easy to get someone to fund the peer review and editing required to get it into a journal.