SACD 2

A few weeks ago someone started a thread about SACD2 and gave us a link for an article that appeared about it. If Sony were to introduce such a format do you think the new generation of SACD2 players that will likely follow will play the first generation of SACD discs that have already come out?

It is hard for me to imagine that the new players would not play all SACD discs. As ridiculous as it sounds it would not surpirse me if the first several generations of SACD1 players might not play SACD2 discs. Any speculation on this?