As written, your question seems to assume that someone is an important philosopher of science only if they're mentioned in one particular Stanford Encyclopedia article. Both Feyerabend and Quine have entire articles of their own.
There's been relatively little work on the demarcation problem in professional philosophy of science over the past 30 years or so. The SEPh article's gloss on Laudan (1983) pretty much sums up where most professional philosophers are these days: "there is no hope of finding a necessary and sufficient criterion of something as heterogeneous as scientific methodology."
I can't think of any recent work on Quine and demarcation off the top of my head. But there's been an active debate between Ian James Kidd and Massimo Pigliucci over the past year (see here here here and here). Briefly, Kidd has very actively been promoting renewed attention to Feyerabend's work, arguing that Feyerabend's positions are much more reasonable than his contemporary critics made them seem, and indeed that Feyerabend's positions are often very similar to some mainstream feminist and pragmatist positions today. This includes defending Feyerabend from the charge that he advocated pseudoscience in an infamous defense of astrology. (For a list of Kidd's papers and books on Feyerabend, see here.) On the other hand, Pigliucci has been trying to revive work on the demarcation problem; I think he's motivated by the trope that there's a crisis in public confidence in science, and thinks that solving the demarcation problem can restore this confidence. Astrology is one of the standard examples of pseudoscience, so of course he didn't want to let a defense of astrology go completely unanswered. On Pigliucci's view, pseudoscience is a family resemblance concept, roughly characterized by a combination of low empirical support and theoretical articulation (see here).
This debate attracted a little attention, but it's too recent to tell whether it's going to amount to an important new chapter in work on the demarcation problem. Since the SEPh article on demarcation is only three years old, it's not surprising that it doesn't include a debate that happened last year.