I'm not able to see what is happening within their chapterhouse and therefore I can't really judge it.However, what I am aware of is the low adherence to their order.
If the situation becomes too dire, perhaps you GMs should consider dismantling them and establishing a minor order in their place (Windriders, Radiant cross, Valkyries), which would draw attention of new players. Another option would be to do as was done with the Silvermists, i.e. merging them with another order (e.g. make the minor order come to Ethos seeking refuge) - there was a time when half of our members were Clarion rangers, so you see how that might also boost interest in the Gauntlet, and thus would allow more players to join them. At any rate, as I see it, keeping it as it is will hardly be fruitful.