I could easily argue the opposite way: Once perfect sex becomes something you can easily buy in a form of sex robots, and the practice becomes so widespread that it will be socially accepted by the mainstream... maybe the partner relationships will become better, because people would use them to optimize for other values -- such as being nice to each other, being a good conversational partner, etc.
And those people who can't provide any other value, they will stay at home with their sexbots, and won't pass their genes to another generation. Genetic pool improved and overpopulation solved using this one simple trick!
(I am not suggesting this as a serious prediction, just as an example that you can easily verbally argue towards almost any bottom line.)
Why would he therefore advocate something so preposterous and so disrespectful
I use ad-blocking software, so the most obvious hypothesis is a bit difficult to verify, but the prior probability is so high I would still bet on it.
I could easily argue the opposite way: Once perfect sex becomes something you can easily buy in a form of sex robots, and the practice becomes so widespread that it will be socially accepted by the mainstream... maybe the partner relationships will become better, because people would use them to optimize for other values -- such as being nice to each other, being a good conversational partner, etc.
Has this happened with any other technologically supplied superstimulus?
Speaking from personal experience, finding the right relationship can be HARD. I recently came across a rational take on finding relationship partners, much of which really resonated with my experiences:
http://waitbutwhy.com/2014/02/pick-life-partner.html
http://waitbutwhy.com/2014/02/pick-life-partner-part-2.html
(I'm still working my way through the Sequences, and lw has more than eight thousand articles with "relationship" in them. I'm not promising the linked articles include unique information)