Some things just aren't a priority in the same way others are. Wsan has been doing all sorts of work on Khor'minos Things (including Brihaus) and Savin has been working on major plot things like Ring of Fate and now RynQuest, so corruption content for their respective companions hasn't been at the top of the pile. Actually, I could easily see Ryn's hypothesized demonification legitimately being dropped (though it was always a 'this could happen' deal, not 'this will happen') simply on the basis of 'She's already a parser nightmare, adding anything more would be the Olympic weightlifter's barbells that snapped the camel's back in twain'.
But in any event, something not getting worked on for a while does not mean it's been cut, it just means the writer in question hasn't gotten to it yet unless we're told otherwise. There's lots of content in the game that goes for long periods of time without updates, but that doesn't make it abandoned. By way of example, if you played the game several years ago, you might well have thought from the lack of updates that Cat Call was abandoned content because it went for about a year and a half between learning where you needed to go next from Evergreen to being able to actually go there and finish things. Despite lying fallow for so long, it got finished when the stars aligned for Savin to be able to do the work for it.
