CUDA is just this season's external DSP box. Given the continually - and increasingly - rapid increases in cheap native power, it's a concept that no longer makes any sense.
External processing power boxes are a blind alley, made out of solid chunks of imminent obsolescence. Ask anyone who dropped two grand on a Duende and plugs. Smart developers are not wasting their time on these things. I mean, even ProTools is finally moving away from this paradigm.
I don't generally have much of an opinion on what Cakewalk spend their resources on, it's not my business and largely not even a concern. But I'd be both surprised and disappointed if it was something like CUDA.