Yes, it will definitely be a 'hot topic'! I happened to run into Wildhorse and his wife while we were both 'hunting and gathering' at our local thrift store, and this story had us talking for quite some time.
Right now, for whatever reason, I'm somehow leaning much more toward the 'natural causes' theories--if I were forced to guess, I'd say that they went on an ordinary hike, probably with some hallucinogens in hand, and perhaps as a result of those substances, made some bad, crazy decisions that ended with them getting lost, dehydrated, and stuck down some crevice or hole, where they died. I'm leaning away from the 'planned disappearance' theories, because everything we've learned about the two suggests neither possessed the kind of knowledge, fitness, or financial resources that would be required to carry off such a difficult scheme. It's true that the involvement of the US Marshals suggests 'planned disappearance', but I tend to think that it was more a matter of the NPS covering themselves against all possibilities, and that they asked the Marshals (whose area of expertise is finding people who don't want to be found) to make sure the couple are not outside the park.
That's my latest theory, at any rate. It could be different tomorrow--or by the time we meet up in Victoria Park.

Q: How many therapists does it take to screw in a light bulb? A: Only one, but the light bulb has to want to change ...