Absolutely not.
It most certainly would be a bad move.
Good thing it is a rumour.
With the large sales to people buying for this Christmas (those cheap HD DVD players), for others.
Those people have not even unpacked their players yet, and once they do, just after X-mas you will most certainly see a boom in HD DVD sales.
While BD will have sold a lot of PS3s, they will not by any means have competed with the the large volume of HD DVD players that have been sold, specifically for HD movies.