I think there are a lot of people who have wanted to combine the best possible grips (I love the mcgu) with FFB who haven't been happy with either the pricing and/or features of the existing solutions
maybe they don't need one, but if they liked it and made it a part of their testing the module developers might get kicked around a bit until they get their ffb implementation sorted
like with trackir a long time ago, if the developers experience it and see the utility they will be inclined to support it even if it's not very popular tech quite yet
People seem to already be willing to shell out about 600€ for a high end stick and if you already have the grip anyway, Rhino is not that much more expensive