If anything, I would expect the ratio (again, ~16%) to drop even closer to the average consumer population.
We can safely assume the hardcore Sony faithful have largely bought in to the new system; the people that are still playing with a PS2 would be casual players, and casual players do not tend to have affinity for any particular company.
In other words, if even the hardcore, buy-a-new-system-within-the-first-year-or-so players are showing only a slight preference, then I think the casual PS2 owners will be even less preferential towards the PS3. I wouldn't be surprised to see the average PS2 owner end up skewing towards the PS3 by less than 10%, from the 16% it's at now.
http://i14.photobucket.com/albums/a324/Arkives/Disccopy.jpg%5B/IMG%5D">
http://i14.photobucket.com/albums/a324/Arkives/Disccopy.jpg%5B/IMG%5D">







