The average consumer. It's confusing enough for them to figure out that HD DVDs and Blu-rays don't work in standard DVD players, as seen in this picture taken at Wal-Mart. But how are they going to know that Blu-ray discs won't work in HD DVDs, and vice versa?
To both the HD DVD and Blu-ray camps, we just want to congratulate you all on a job well done. And you're wondering why sales of next-gen discs and players are so slow?