I think this is the point that he and I are both trying to make. We already know what the cost to make it compatible is the quote from Cerney below clearly shows.
"Most of the work goes into implementing, in the case of these three titles, checkerboard rendering, in order to get the resolutions up to 2160p, or close to 2160p. And that hasn't been that much," said Cerny. "The initial implementation of checkerboard rendering for each of these titles was 3 weeks, for each of them, by 1 programmer. And you know, these are games where, these days, a typical game will have 100 people, 300 people, for years on end. So we're talking about 1 programmer for a couple of weeks. It's not too much."