It was an example, there are a lot of people who can dump all their bitcoins at once and make bitcoin crash to a point when power costs will exceed the worth of the mined bitcoins. If someone offers you then a fraction of your investment for your infrastructure it could be seductice to cut your losses. I'm just pointing at a possible scenario. Of course its open ended, that is the nature of talking about theoretical future events, like your open ended comment about the mutability of a 51% attack and this whole article ;)