Wow... what a strange argument. I'm still trying to wrap my head around it.
I think you missed the OP's initial point, but I'll put forth this question:
Do you believe that we should just put BD+ on all media to save the rental second-hand market?
I can guarantee you the fact that the second-hand DVD (BD, or HD DVD) market is one that the studios don't care for... at all. It was not too long ago that the RIAA got in a tizzy about people selling used CDs on eBay, simply because it cut into their opportunity to sell their shiny new shrink-wrapped crap.
No one cares about the second-hand DVD/HD DVD/Blu-Ray market. In fact, if the studio's had their way... they would make you buy a copy of a movie for *every possible way* you could play back the media that you purchased.
I'm wondering if you could explain your position a bit more...