Yes I did think that might be one application, though I'm not sure how sold I would be even then. To each their own, and perhaps it would be better than nothing, but it would kill the intimacy aspect for me.
And sure, this is opening up a entirely new avenue on top of phone/cyber/webcam sex that wasn't available before, and marks a massive step forward in what's available when people are geographically separate.
I tend not to bother with LDRs either, I must admit, I think they're mostly a bad thing.