No, Nintendo is showing the opposite, that the Wii has started sellling beyond it's GameCube database, and its started to both eat into PS2 market and grow the market in general. I'm sure most analysts present at the presentation got that message loud and clear.
As for the rest, if you paid any attention to the first chart at all, you'd see that the Xbox was a clear 2nd in terms of sales in 2005 as well. Only your last comment, Paranoia, is where I'm inferring things based on the data presented. Obviously, 360 and Wii are going to try to win some of the PS2's market share, as in terms of next-gen software sales, that market is still up for grabs. If anything the PS3 has shown, its lateness has allowed the other two to fairly comfortably migrate their markets to next-gen, without having had to fear too much of losing market share to Sony. Now the battle for the PS2 user base begins, and Sony will have a harder time to bring its existing user base to the PS3.
The only point where I think there is room for disagreement is whether or not Nintendo's and Microsoft's next-gen sales transition is any kind of indication for Sony's next-gen sales transition potential. I'm saying yes, you're saying no. Let's agree to disagree then, and come back here next year.